jointworm vs larva

jointworm and larva both are nouns.

Word	Noun	Adjective	Verb	Adverb
jointworm	Yes	No	No	No
larva	Yes	No	No	No

As nouns, larva is a hypernym of jointworm; that is, larva is a word with a broader meaning than jointworm:

jointworm: larva of chalcid flies injurious to the straw of wheat and other grains
larva: the immature free-living form of most invertebrates and amphibians and fish which at hatching from the egg is fundamentally unlike its parent and must metamorphose

jointworm (noun)	larva (noun)
larva of chalcid flies injurious to the straw of wheat and other grains	the immature free-living form of most invertebrates and amphibians and fish which at hatching from the egg is fundamentally unlike its parent and must metamorphose