Phlebotomus papatasii vs gnat

Phlebotomus papatasii and gnat both are nouns.

Word	Noun	Adjective	Verb	Adverb
Phlebotomus papatasii	Yes	No	No	No
gnat	Yes	No	No	No

As nouns, gnat is a hypernym of Phlebotomus papatasii; that is, gnat is a word with a broader meaning than Phlebotomus papatasii:

Phlebotomus papatasii: any of various small dipterous flies; bloodsucking females can transmit sandfly fever and leishmaniasis
gnat: any of various small biting flies: midges; biting midges; black flies; sand flies

Phlebotomus papatasii (noun)	gnat (noun)
any of various small dipterous flies; bloodsucking females can transmit sandfly fever and leishmaniasis	any of various small biting flies: midges; biting midges; black flies; sand flies
	(British usage) mosquito