How many letters does the top answer for “a substance that retards or stops an activity” have?

The most common answer is inhibitor (9 letters).

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Crossword clue: a substance that retards or stops an activity

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

inhibitor 9 letters wn-def

a substance that retards or stops an activity

Pattern

Data: SCOWL, igerman98, RLA-ES, Grammalecte, br.ispell · frequency: OpenSubtitles (see Data & licenses)