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

The most common answer is indicant (8 letters).

Crossword clue: another word for index

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

indicant 8 letters gen-syn

a number or ratio (a value on a scale of measurement) derived from a series of observed facts; can reveal relative chang

indicator 9 letters gen-syn

a number or ratio (a value on a scale of measurement) derived from a series of observed facts; can reveal relative chang

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