earthman vs tellurian

earthman and tellurian both are nouns.

Word	Noun	Adjective	Verb	Adverb
earthman	Yes	No	No	No
tellurian	Yes	Yes	No	No

As nouns, earthman and tellurian are synonyms defined as:

Other synonyms of earthman include earthling, worldling.

earthman (noun)	tellurian (noun)
an inhabitant of the earth	an inhabitant of the earth

earthman (adjective)	tellurian (adjective)
	of or relating to or inhabiting the land as opposed to the sea or air