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"sound" is also used as a crossword clue. If that's what you saw, the answer is often audio (5 letters).
Definitions
Noise; in good condition
Word origin
From Middle English sound, sund, isund, ȝesund, from Old English sund (“sound, safe, whole, uninjured, healthy, prosperous”), from Proto-West Germanic *sund, from Proto-Germanic *sundaz (“healthy”), merged with synonymous Old English ġesund, from Proto-West Germanic *gasund.
Used in a sentence
“He was safe and sound.”
“In horse management a sound horse is one with no health problems that might affect its suitability for its intended work.”
“Fred assured me the floorboards were sound.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer9 curated clues
01“Audible vibration”5 letters
02“Audio”5 letters
03“Noise”5 letters
04“Noise heard”5 letters
05“Noise or audio”5 letters
06“Noise or tone”5 letters
07“Thing heard”5 letters
08“What ears detect”5 letters
09“Noise you hear”5 letters
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