onychophoran vs velvet worm

onychophoran and velvet worm both are nouns.

Word	Noun	Adjective	Verb	Adverb
onychophoran	Yes	No	No	No
velvet worm	Yes	No	No	No

As nouns, onychophoran and velvet worm are synonyms defined as:

onychophoran and velvet worm: any of numerous velvety-skinned wormlike carnivorous animals common in tropical forests having characteristics of both arthropods and annelid worms

Other synonyms of onychophoran include peripatus.

onychophoran (noun)	velvet worm (noun)
any of numerous velvety-skinned wormlike carnivorous animals common in tropical forests having characteristics of both arthropods and annelid worms	any of numerous velvety-skinned wormlike carnivorous animals common in tropical forests having characteristics of both arthropods and annelid worms