How many letters does the top answer for “an acoustic device; the part of a telephone into which a person speaks” have?

The most common answer is mouthpiece (10 letters).

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Crossword clue: an acoustic device; the part of a telephone into which a person speaks

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

mouthpiece 10 letters wn-def

an acoustic device; the part of a telephone into which a person speaks

Pattern

Data: SCOWL, igerman98, RLA-ES, Grammalecte, br.ispell · frequency: OpenSubtitles (see Data & licenses)