interdenominational vs interchurch

interdenominational and interchurch both are adjectives.

Word	Noun	Adjective	Verb	Adverb
interdenominational	No	Yes	No	No
interchurch	No	Yes	No	No

As adjectives, interdenominational and interchurch are synonyms defined as:

interdenominational and interchurch: occurring between or among or common to different churches or denominations

interdenominational (adjective)	interchurch (adjective)
occurring between or among or common to different churches or denominations	occurring between or among or common to different churches or denominations