species vs variant

species and variant both are nouns.

Word	Noun	Adjective	Verb	Adverb
species	Yes	No	No	No
variant	Yes	Yes	No	No

species (noun)	variant (noun)
a specific kind of something	a variable quantity that is random
(biology) taxonomic group whose members can interbreed	something a little different from others of the same type
	an event that departs from expectations
	(biology) a group of organisms within a species that differ in trivial ways from similar groups

species (adjective)	variant (adjective)
	differing from a norm or standard
	exhibiting variation and change