How many letters does the top answer for “occurring between or among or common to different churches or denominations” have?

The most common answer is interchurch (11 letters).

Crossword clue: occurring between or among or common to different churches or denominations

interchurch, interdenominational.

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

interchurch 11 letters wn-def

occurring between or among or common to different churches or denominations

interdenominational 19 letters wn-def

occurring between or among or common to different churches or denominations