conglomeration vs combining

conglomeration and combining both are nouns.

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

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

conglomeration: an occurrence combining miscellaneous things into a (more or less) rounded mass
combining: an occurrence that results in things being united

Other hypernyms of conglomeration include combine.

conglomeration (noun)	combining (noun)
an occurrence combining miscellaneous things into a (more or less) rounded mass	the act of combining things to form a new whole
a sum total of many heterogenous things taken together	an occurrence that results in things being united
a rounded spherical form