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

The most common answer is crabwise (8 letters).

Crossword clue: another word for sideways

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

crabwise 8 letters gen-syn

(of movement) at an angle

sidelong 8 letters gen-syn

(used especially of glances) directed to one side with or as if with doubt or suspicion or envy

another word for sideway 100% similar → sideward, sidewards, sidewise

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