tettigoniid vs grasshopper

tettigoniid and grasshopper both are nouns.

Word	Noun	Adjective	Verb	Adverb
tettigoniid	Yes	No	No	No
grasshopper	Yes	No	No	No

As nouns, grasshopper is a hypernym of tettigoniid; that is, grasshopper is a word with a broader meaning than tettigoniid:

tettigoniid: grasshoppers with long threadlike antennae and well-developed stridulating organs on the forewings of the male
grasshopper: terrestrial plant-eating insect with hind legs adapted for leaping

Other hypernyms of tettigoniid include hopper.

tettigoniid (noun)	grasshopper (noun)
grasshoppers with long threadlike antennae and well-developed stridulating organs on the forewings of the male	terrestrial plant-eating insect with hind legs adapted for leaping
	a cocktail made of creme de menthe and cream (sometimes with creme de cacao)