How many letters does the top answer for “any of a group of steroid hormones that have the effect of progesterone” have?

The most common answer is progestin (9 letters).

Crossword clue: any of a group of steroid hormones that have the effect of progesterone

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

progestin 9 letters wn-def

any of a group of steroid hormones that have the effect of progesterone

progestogen 11 letters wn-def

any of a group of steroid hormones that have the effect of progesterone