spittlebug vs spittle insect

spittlebug and spittle insect both are nouns.

Word	Noun	Adjective	Verb	Adverb
spittlebug	Yes	No	No	No
spittle insect	Yes	No	No	No

As nouns, spittlebug and spittle insect are synonyms defined as:

spittlebug and spittle insect: small leaping herbivorous insect that lives in a mass of protective froth which it and its larvae secrete

spittlebug (noun)	spittle insect (noun)
small leaping herbivorous insect that lives in a mass of protective froth which it and its larvae secrete	small leaping herbivorous insect that lives in a mass of protective froth which it and its larvae secrete