How many letters does the top answer for “a cross between a male zebra and a female horse.” have?

The most common answer is zebrula (7 letters).

Crossword clue: a cross between a male zebra and a female horse.

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

zebrula 7 letters web-def

A cross between a male zebra and a female horse.

zebrule 7 letters web-def

A cross between a male zebra and a female horse.

a cross between a male horse and a female zebra. 100% similar → zebrinny