deciding vs selection

deciding and selection both are nouns.

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

As nouns, selection is a hyponym of deciding; that is, selection is a word with a more specific, narrower meaning than deciding:

deciding (noun)	selection (noun)
the cognitive process of reaching a decision	the act of choosing or selecting
	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

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