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

The most common answer is curio (5 letters).

Crossword clue: another word for rarity

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

curio 5 letters gen-syn

something unusual -- perhaps worthy of collecting

oddity 6 letters gen-syn

something unusual -- perhaps worthy of collecting

oddment 7 letters gen-syn

something unusual -- perhaps worthy of collecting

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