louse fly vs sheep tick

louse fly and sheep tick both are nouns.

Word	Noun	Adjective	Verb	Adverb
louse fly	Yes	No	No	No
sheep tick	Yes	No	No	No

As nouns, sheep tick is a hyponym of louse fly; that is, sheep tick is a word with a more specific, narrower meaning than louse fly:

Other hyponyms of louse fly include Hippobosca equina, horse tick, horsefly, Melophagus Ovinus, sheep-tick, sheep ked.

louse fly (noun)	sheep tick (noun)
bloodsucking dipterous fly parasitic on birds and mammals	wingless fly that is an external parasite on sheep and cattle
	parasitic on sheep and cattle as well as humans; can transmit louping ill in sheep (acute viral disease of the nervous system); a vector for Lyme disease spirochete