diff --git a/distribution/openrct2.d.ts b/distribution/openrct2.d.ts
index 892b4cce63..3954ce5b9b 100644
--- a/distribution/openrct2.d.ts
+++ b/distribution/openrct2.d.ts
@@ -4474,7 +4474,7 @@ declare global {
         readonly category: RideResearchCategory;
 
         /**
-         * The ride type. Each vehicle can have a seperate invention for each ride type.
+         * The ride type. Each vehicle can have a separate invention for each ride type.
          */
         readonly rideType: number;
 
@@ -5056,7 +5056,7 @@ declare global {
         column: number;
     }
 
-    type ListViewItem = ListViewItemSeperator | string[] | string;
+    type ListViewItem = ListViewItemSeparator | string[] | string;
 
     interface ListViewWidget extends WidgetBase {
         type: "listview";
@@ -5183,8 +5183,8 @@ declare global {
         textAlign?: TextAlignment;
     }
 
-    interface ListViewItemSeperator {
-        type: "seperator";
+    interface ListViewItemSeparator {
+        type: "separator";
         text?: string;
     }
 
diff --git a/scripts/format-changelog.js b/scripts/format-changelog.js
index e2949079c4..f790a10ffd 100644
--- a/scripts/format-changelog.js
+++ b/scripts/format-changelog.js
@@ -6,7 +6,7 @@ const ChangeTypes = ["Headline feature", "Feature", "Improved", "Change", "Remov
 const ChangeTypeSubstitutions = {
     "Improve": "Improved",
 };
-const HeaderSeperator = "------------------------------------------------------------------------";
+const HeaderSeparator = "------------------------------------------------------------------------";
 
 function reportError(ctx, message) {
     console.error(`Error on line ${ctx.lineIndex}: ${message}`);
@@ -42,10 +42,10 @@ function readVersionHeader(ctx) {
         reportLineError(versionLine, "Expected a version number");
     }
 
-    // Check the version seperator
-    const versionSeperator = consumeLine(ctx);
-    if (versionSeperator.text != HeaderSeperator) {
-        reportLineError(versionSeperator, "Expected version seperator");
+    // Check the version separator
+    const versionSeparator = consumeLine(ctx);
+    if (versionSeparator.text != HeaderSeparator) {
+        reportLineError(versionSeparator, "Expected version separator");
     }
 
     // Check for optional headline, this means the there is text not starting with - and an empty line before
@@ -263,7 +263,7 @@ function cleanupVersions(versions) {
 function printChangelog(versions) {
     for (const version of versions) {
         console.log(`${version.version} (${version.date})`);
-        console.log(HeaderSeperator);
+        console.log(HeaderSeparator);
         if (version.headline != "") {
             console.log(version.headline);
             console.log();
diff --git a/src/openrct2-ui/scripting/CustomListView.cpp b/src/openrct2-ui/scripting/CustomListView.cpp
index 69a279a692..b2e75fdff5 100644
--- a/src/openrct2-ui/scripting/CustomListView.cpp
+++ b/src/openrct2-ui/scripting/CustomListView.cpp
@@ -125,7 +125,8 @@ namespace OpenRCT2::Scripting
         else if (d.type() == DukValue::Type::OBJECT)
         {
             auto type = ProcessString(d["type"]);
-            if (type == "seperator")
+            // This type was misspelt between 2020 and 2025.
+            if (type == "separator" || type == "separator")
             {
                 auto text = ProcessString(d["text"]);
                 result = ListViewItem(text);
@@ -584,7 +585,7 @@ void CustomListView::Paint(WindowBase* w, RenderTarget& rt, const ScrollArea* sc
             {
                 const auto& text = item.Cells[0];
                 ScreenSize cellSize = { LastKnownSize.width, kListRowHeight };
-                PaintSeperator(rt, { 0, y }, cellSize, text.c_str());
+                PaintSeparator(rt, { 0, y }, cellSize, text.c_str());
             }
             else
             {
@@ -703,7 +704,7 @@ void CustomListView::PaintHeading(
     }
 }
 
-void CustomListView::PaintSeperator(RenderTarget& rt, const ScreenCoordsXY& pos, const ScreenSize& size, const char* text) const
+void CustomListView::PaintSeparator(RenderTarget& rt, const ScreenCoordsXY& pos, const ScreenSize& size, const char* text) const
 {
     auto hasText = text != nullptr && text[0] != '\0';
     auto left = pos.x + 4;
diff --git a/src/openrct2-ui/scripting/CustomListView.h b/src/openrct2-ui/scripting/CustomListView.h
index db5578a32f..ab00a4a21f 100644
--- a/src/openrct2-ui/scripting/CustomListView.h
+++ b/src/openrct2-ui/scripting/CustomListView.h
@@ -144,7 +144,7 @@ namespace OpenRCT2::Ui::Windows
         void PaintHeading(
             WindowBase* w, RenderTarget& rt, const ScreenCoordsXY& pos, const ScreenSize& size, const std::string& text,
             ColumnSortOrder sortOrder, bool isPressed) const;
-        void PaintSeperator(RenderTarget& rt, const ScreenCoordsXY& pos, const ScreenSize& size, const char* text) const;
+        void PaintSeparator(RenderTarget& rt, const ScreenCoordsXY& pos, const ScreenSize& size, const char* text) const;
         void PaintCell(
             RenderTarget& rt, const ScreenCoordsXY& pos, const ScreenSize& size, const char* text, bool isHighlighted) const;
         std::optional<RowColumn> GetItemIndexAt(const ScreenCoordsXY& pos);
diff --git a/src/openrct2/scripting/bindings/world/ScTileElement.cpp b/src/openrct2/scripting/bindings/world/ScTileElement.cpp
index c782d4f550..16029eaba8 100644
--- a/src/openrct2/scripting/bindings/world/ScTileElement.cpp
+++ b/src/openrct2/scripting/bindings/world/ScTileElement.cpp
@@ -1584,7 +1584,7 @@ namespace OpenRCT2::Scripting
         }
     }
 
-    // Deprecated in favor of seperate 'edges' and 'corners' properties,
+    // Deprecated in favor of separate 'edges' and 'corners' properties,
     // left here to maintain compatibility with older plugins.
     /** @deprecated */
     uint8_t ScTileElement::edgesAndCorners_get() const
diff --git a/src/openrct2/scripting/bindings/world/ScTileElement.hpp b/src/openrct2/scripting/bindings/world/ScTileElement.hpp
index 8e0953277d..bb1f6ab22d 100644
--- a/src/openrct2/scripting/bindings/world/ScTileElement.hpp
+++ b/src/openrct2/scripting/bindings/world/ScTileElement.hpp
@@ -145,7 +145,7 @@ namespace OpenRCT2::Scripting
         DukValue bannerIndex_get() const;
         void bannerIndex_set(const DukValue& value);
 
-        // Deprecated in favor of seperate 'edges' and 'corners' properties,
+        // Deprecated in favor of separate 'edges' and 'corners' properties,
         // left here to maintain compatibility with older plugins.
         /** @deprecated */
         uint8_t edgesAndCorners_get() const;