hawkmoth vs hawk moth

hawkmoth and hawk moth both are nouns.

Word	Noun	Adjective	Verb	Adverb
hawkmoth	Yes	No	No	No
hawk moth	Yes	No	No	No

As nouns, hawkmoth and hawk moth are synonyms defined as:

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

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

hawkmoth (noun)	hawk 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