How many letters does the top answer for “make a rhythmic sound” have?

The most common answer is thrum (5 letters).

Crossword clue: make a rhythmic sound

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

thrum 5 letters wn-def

a thrumming sound

make a buzzing sound 50% similar → bombinate, buzz

make a crackling sound 50% similar → crackle, crepitate

make a murmuring sound 50% similar → purl, sough

make a rattling sound 50% similar → brattle, clatter

make a strident sound 50% similar → blare, blast