sphinx moth vs sphingid

sphinx moth and sphingid both are nouns.

Word	Noun	Adjective	Verb	Adverb
sphinx moth	Yes	No	No	No
sphingid	Yes	No	No	No

As nouns, sphinx moth and sphingid are synonyms defined as:

sphinx moth and sphingid: any of various moths with long narrow forewings capable of powerful flight and hovering over flowers to feed

Other synonyms of sphinx moth include hawk moth, hawkmoth, hummingbird moth.

sphinx moth (noun)	sphingid (noun)
any of various moths with long narrow forewings capable of powerful flight and hovering over flowers to feed	any of various moths with long narrow forewings capable of powerful flight and hovering over flowers to feed