How many letters does the top answer for “the central building block at the top of an arch or vault” have?

The most common answer is keystone (8 letters).

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Crossword clue: the central building block at the top of an arch or vault

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

keystone 8 letters wn-def

the central building block at the top of an arch or vault

Pattern

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