How many letters does the top answer for “using the name of one thing for that of another with which it is closely associated” have?

The most common answer is metonymic (9 letters).

Crossword clue: using the name of one thing for that of another with which it is closely associated

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

metonymic 9 letters wn-def

using the name of one thing for that of another with which it is closely associated

metonymical 11 letters wn-def

using the name of one thing for that of another with which it is closely associated