deciding vs decision making

deciding and decision making both are nouns.

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

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

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

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

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