How many letters does the top answer for “a notch or open space between two merlons in a crenelated battlement” have?

The most common answer is crenel (6 letters).

Crossword clue: a notch or open space between two merlons in a crenelated battlement

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

crenel 6 letters wn-def

a notch or open space between two merlons in a crenelated battlement

crenelle 8 letters wn-def

a notch or open space between two merlons in a crenelated battlement