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

The most common answer is goober (6 letters).

Crossword clue: another word for peanut

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

goober 6 letters gen-syn

pod of the peanut vine containing usually 2 nuts or seeds; `groundnut' and `monkey nut' are British terms

groundnut 9 letters gen-syn

pod of the peanut vine containing usually 2 nuts or seeds; `groundnut' and `monkey nut' are British terms

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