hominid vs hominian

hominid is a noun but hominian is not a noun.

Word	Noun	Adjective	Verb	Adverb
hominid	Yes	Yes	No	No
hominian	No	Yes	No	No

As adjectives, hominid and hominian are synonyms defined as:

hominid and hominian: characterizing the family Hominidae, which includes Homo sapiens as well as extinct species of manlike creatures

hominid (noun)	hominian (noun)
a primate of the family Hominidae

hominid (adjective)	hominian (adjective)
characterizing the family Hominidae, which includes Homo sapiens as well as extinct species of manlike creatures	characterizing the family Hominidae, which includes Homo sapiens as well as extinct species of manlike creatures