diff --git a/packages/backend-rs/src/util/check_word_mute.rs b/packages/backend-rs/src/util/check_word_mute.rs
index 865dc18c..38e4b7f3 100644
--- a/packages/backend-rs/src/util/check_word_mute.rs
+++ b/packages/backend-rs/src/util/check_word_mute.rs
@@ -79,7 +79,7 @@ fn check_word_mute_impl(
             let text_lower = text.to_lowercase();
             muted_word_list
                 .iter()
-                .all(|muted_word| text_lower.contains(muted_word))
+                .all(|muted_word| text_lower.contains(&muted_word.to_lowercase()))
         })
     }) || muted_patterns.iter().any(|muted_pattern| {
         Regex::new(convert_regex(muted_pattern).as_str())
diff --git a/packages/backend/src/server/api/endpoints/notes/mentions.ts b/packages/backend/src/server/api/endpoints/notes/mentions.ts
index 44ee9093..b1eef162 100644
--- a/packages/backend/src/server/api/endpoints/notes/mentions.ts
+++ b/packages/backend/src/server/api/endpoints/notes/mentions.ts
@@ -7,6 +7,7 @@ import { generateMutedUserQuery } from "@/server/api/common/generate-muted-user-
 import { makePaginationQuery } from "@/server/api/common/make-pagination-query.js";
 import { generateBlockedUserQuery } from "@/server/api/common/generate-block-query.js";
 import { generateMutedNoteThreadQuery } from "@/server/api/common/generate-muted-note-thread-query.js";
+import { generateMutedNoteQuery } from "@/server/api/common/generate-muted-note-query.js";
 
 export const meta = {
 	tags: ["notes"],
@@ -69,6 +70,7 @@ export default define(meta, paramDef, async (ps, user) => {
 
 	generateVisibilityQuery(query, user);
 	generateMutedUserQuery(query, user);
+	generateMutedNoteQuery(query, user);
 	generateMutedNoteThreadQuery(query, user);
 	generateBlockedUserQuery(query, user);
 
diff --git a/packages/backend/src/services/note/create.ts b/packages/backend/src/services/note/create.ts
index 9beb4e6c..7e8bcabe 100644
--- a/packages/backend/src/services/note/create.ts
+++ b/packages/backend/src/services/note/create.ts
@@ -887,14 +887,17 @@ async function createMentionedEvents(
 	nm: NotificationManager,
 ) {
 	for (const u of mentionedUsers.filter((u) => Users.isLocalUser(u))) {
-		const threadMuted = await NoteThreadMutings.findOneBy({
+		const isWordMuted = await MutedNotes.existsBy({
 			userId: u.id,
-			threadId: note.threadId || note.id,
+			noteId: note.id,
 		});
+		if (isWordMuted) continue;
 
-		if (threadMuted) {
-			continue;
-		}
+		const isThreadMuted = await NoteThreadMutings.existsBy({
+			userId: u.id,
+			threadId: note.threadId ?? note.id,
+		});
+		if (isThreadMuted) continue;
 
 		// note with "specified" visibility might not be visible to mentioned users
 		try {