How many letters does the top answer for “of a moderate purple color” have?

The most common answer is amethyst (8 letters).

Crossword clue: of a moderate purple color

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

amethyst 8 letters wn-def

a transparent purple variety of quartz; used as a gemstone

of a purple color; purple. 67% similar → purpureal

a pale purple color 50% similar → lavender

author of the color purple 50% similar → busia, goldberg, walker

composer of the color purple 50% similar → busia, goldberg

of a pale purple color 50% similar → lilac

wrote the color purple 50% similar → busia, goldberg, walker