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

The most common answer is brattle (7 letters).

Crossword clue: make a rattling sound

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

brattle 7 letters wn-def

make a rattling sound

clatter 7 letters wn-def

make a rattling 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 rhythmic sound 50% similar → thrum

make a strident sound 50% similar → blare, blast