How many letters does the top answer for “an adult who is sexually attracted to children” have?

The most common answer is paedophile (10 letters).

Crossword clue: an adult who is sexually attracted to children

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

paedophile 10 letters wn-def

an adult who is sexually attracted to children

pedophile 9 letters wn-def

an adult who is sexually attracted to children