decision making vs deciding

decision making and deciding both are nouns.

Word	Noun	Adjective	Verb	Adverb
decision making	Yes	No	No	No
deciding	Yes	Yes	No	No

As nouns, decision making and deciding are synonyms defined as:

decision making and deciding: the cognitive process of reaching a decision

decision making (noun)	deciding (noun)
the cognitive process of reaching a decision	the cognitive process of reaching a decision

decision making (adjective)	deciding (adjective)
	having the power or quality of deciding