hellgrammiate vs larva

hellgrammiate and larva both are nouns.

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

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

hellgrammiate: large brown aquatic larva of the dobsonfly; used as fishing bait
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

hellgrammiate (noun)	larva (noun)
large brown aquatic larva of the dobsonfly; used as fishing bait	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