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

The most common answer is begin (5 letters).

Crossword clue: another word for start

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

begin 5 letters gen-syn

take the first step or steps in carrying out an action

commence 8 letters gen-syn

take the first step or steps in carrying out an action

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