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

The most common answer is swingletree (11 letters).

Crossword clue: another word for whiffletree

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

swingletree 11 letters gen-syn

a crossbar that is attached to the traces of a draft horse and to the vehicle or implement that the horse is pulling

whippletree 11 letters gen-syn

a crossbar that is attached to the traces of a draft horse and to the vehicle or implement that the horse is pulling

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