sphinx moth vs hummingbird moth

sphinx moth and hummingbird moth both are nouns.

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

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

sphinx moth and hummingbird moth: 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, sphingid.

sphinx moth (noun)	hummingbird moth (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