integration vs combining

integration and combining both are nouns.

Word	Noun	Adjective	Verb	Adverb
integration	Yes	No	No	No
combining	Yes	No	No	No

As nouns, combining is a hypernym of integration; that is, combining is a word with a broader meaning than integration:

Other hypernyms of integration include combination, compounding.

integration (noun)	combining (noun)
the action of incorporating a racial or religious group into a community	the act of combining things to form a new whole
the act of combining into an integral whole	an occurrence that results in things being united
an operation used in the calculus whereby the integral of a function is determined