selection vs deciding

selection and deciding both are nouns.

Word	Noun	Adjective	Verb	Adverb
selection	Yes	No	No	No
deciding	Yes	Yes	No	No

As nouns, deciding is a hypernym of selection; that is, deciding is a word with a broader meaning than selection:

Other hypernyms of selection include decision making.

selection (noun)	deciding (noun)
the act of choosing or selecting	the cognitive process of reaching a decision
the person or thing chosen or selected
a passage selected from a larger work
an assortment of things from which a choice can be made
a natural process resulting in the evolution of organisms best adapted to the environment

selection (adjective)	deciding (adjective)
	having the power or quality of deciding