var. vs taxon

var. and taxon both are nouns.

Word	Noun	Adjective	Verb	Adverb
var.	Yes	No	No	No
taxon	Yes	No	No	No

As nouns, taxon is a hypernym of var.; that is, taxon is a word with a broader meaning than var.:

var.: (biology) a group of organisms within a species that differ in trivial ways from similar groups
taxon: animal or plant group having natural relations

Other hypernyms of var. include taxonomic category, taxonomic group.

var. (noun)	taxon (noun)
(biology) a group of organisms within a species that differ in trivial ways from similar groups	animal or plant group having natural relations