How many letters does the top answer for “a stone for coping. see coping.” have?

The most common answer is copestone (9 letters).

Crossword clue: a stone for coping. see coping.

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

copestone 9 letters web-def

a stone that forms the top of wall or building

a stone curlew. see under stone. 50% similar → thickknee

see jade, the stone. 50% similar → jadeite