warble fly vs gadfly

warble fly and gadfly both are nouns.

Word	Noun	Adjective	Verb	Adverb
warble fly	Yes	No	No	No
gadfly	Yes	No	No	No

As nouns, gadfly is a hypernym of warble fly; that is, gadfly is a word with a broader meaning than warble fly:

warble fly: hairy bee-like fly whose larvae produce lumpy abscesses (warbles) under the skin of cattle
gadfly: any of various large flies that annoy livestock

warble fly (noun)	gadfly (noun)
hairy bee-like fly whose larvae produce lumpy abscesses (warbles) under the skin of cattle	any of various large flies that annoy livestock
	a persistently annoying person