assortment vs selection

assortment and selection both are nouns.

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

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

assortment (noun)	selection (noun)
the act of distributing things into classes or categories of the same type	the act of choosing or selecting
a collection containing a variety of sorts of things	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