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

The most common answer is competitor (10 letters).

Crossword clue: another word for challenger

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

competitor 10 letters gen-syn

the contestant you hope to defeat

contender 9 letters gen-syn

the contestant you hope to defeat

rival 5 letters gen-syn

be equal to in quality or ability

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