How many letters does the top answer for “capability of being cured or healed” have?

The most common answer is curability (10 letters).

Crossword clue: capability of being cured or healed

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

curability 10 letters wn-def

capability of being cured or healed

curableness 11 letters wn-def

capability of being cured or healed

incapability of being cured or healed 60% similar → incurableness