| Answer | Crossword Clue |
|---|---|
| ECHO | Certain vowel, to pilots |
| circumflex | a mark used over a vowel in certain languages or in phonetic keys to indicate quality of pronunciation |
| circumflexes | CIRCUMFLEX, a mark used over a vowel in certain languages or in phonetic keys to indicate quality of pronunciation |
| SCHWAS | Certain vowel sounds |
| NASALS | Certain French vowel sounds |
| mutations | (in Germanic languages) The process by which the quality of a vowel was altered in certain phonetic contexts; umlaut |
