How many letters does the top answer for “another word for rattling” have?

The most common answer is rale (4 letters).

Crossword clue: another word for rattling

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

rale 4 letters gen-syn

a rapid series of short loud sounds (as might be heard with a stethoscope in some types of respiratory disorders)

rattle 6 letters gen-syn

make short successive sounds

another word for about 50% similar → approximately, roughly, some

another word for terms 50% similar → footing

another word for under 50% similar → nether

another word for word 50% similar → phrase