contributing vs contributory

contributing and contributory both are adjectives.

Word	Noun	Adjective	Verb	Adverb
contributing	No	Yes	No	No
contributory	No	Yes	No	No

As adjectives, contributing and contributory are synonyms defined as:

contributing and contributory: tending to bring about; being partly responsible for

Other synonyms of contributing include conducive, contributive, tributary.

contributing (adjective)	contributory (adjective)
tending to bring about; being partly responsible for	tending to bring about; being partly responsible for