How many letters does the top answer for “resembling or having the qualities of soap” have?

The most common answer is saponaceous (11 letters).

Crossword clue: resembling or having the qualities of soap

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

saponaceous 11 letters wn-def

resembling or having the qualities of soap

having the qualities of butter; resembling butter. 60% similar → butyraceous