thrips vs onion louse

thrips and onion louse both are nouns.

Word	Noun	Adjective	Verb	Adverb
thrips	Yes	No	No	No
onion louse	Yes	No	No	No

As nouns, onion louse is a hyponym of thrips; that is, onion louse is a word with a more specific, narrower meaning than thrips:

thrips: any of various small to minute sucking insects with narrow feathery wings if any; they feed on plant sap and many are destructive
onion louse: injurious to onion plants and sometimes tobacco

Other hyponyms of thrips include Frankliniella fusca, tobacco thrips, onion thrips, Thrips tobaci.

thrips (noun)	onion louse (noun)
any of various small to minute sucking insects with narrow feathery wings if any; they feed on plant sap and many are destructive	injurious to onion plants and sometimes tobacco