monotype vs taxon

monotype and taxon both are nouns.

Word	Noun	Adjective	Verb	Adverb
monotype	Yes	No	No	No
taxon	Yes	No	No	No

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

monotype: (biology) a taxonomic group with a single member (a single species or genus)
taxon: animal or plant group having natural relations

Other hypernyms of monotype include taxonomic category, taxonomic group.

monotype (noun)	taxon (noun)
a typesetting machine operated from a keyboard that sets separate characters	animal or plant group having natural relations
the sole print made by pressing paper against a painted or inked glass or metal plate
(biology) a taxonomic group with a single member (a single species or genus)