Description:

The Chinese character "齁" is NOT a polyphonic character. It has only one correct Mandarin pronunciation: hou1.

However, in Edge TTS, it seems that only the word "齁齁" exists in the lexicon, while the single character "齁" itself does not have a correct entry.

Current behavior:

• "齁" → pronounced as ku4 (incorrect)
• "齁甜" → ku4 tian2 (incorrect)
• "齁甜" → hou1 tian2 (correct)
• "齁咸" → ku4 xian2 (incorrect)
• "齁辣" → ku4 la4 (incorrect)
• "齁齁" → hou1 hou1 (correct)

This indicates that:

• The lexicon contains an entry for "齁齁"
• But the single-character entry "齁 → hou1" is missing
• So when "齁" is not part of "齁齁", the system falls back to a wrong and outputs "ku4"

"齁" has only one correct pronunciation in Mandarin Chinese: hou1. It is NOT a polyphonic character.

This is a lexicon / dictionary coverage issue, not a context or disambiguation issue.

Suggested fix:
Add a correct single-character lexicon entry:
齁 → hou1

Voice tested:
zh-CN-XiaoxiaoNeural (or other voices in Mandarin)