How many letters does the top answer for “relating to or experiencing synesthesia; involving more than one sense” have?

The most common answer is synaesthetic (12 letters).

Crossword clue: relating to or experiencing synesthesia; involving more than one sense

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

synaesthetic 12 letters wn-def

relating to or experiencing synesthesia; involving more than one sense

synesthetic 11 letters wn-def

relating to or experiencing synesthesia; involving more than one sense