combining vs compounding

combining and compounding both are nouns.

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

As nouns, combining and compounding are synonyms defined as:

combining and compounding: the act of combining things to form a new whole

Other synonyms of combining include combination.

combining (noun)	compounding (noun)
the act of combining things to form a new whole	the act of combining things to form a new whole
an occurrence that results in things being united