superman vs demigod

superman and demigod both are nouns.

Word	Noun	Adjective	Verb	Adverb
superman	Yes	No	No	No
demigod	Yes	No	No	No

As nouns, superman and demigod are synonyms defined as:

Other synonyms of superman include Ubermensch.

superman (noun)	demigod (noun)
street name for lysergic acid diethylamide	a person who is part mortal and part god
a person with great powers and abilities	a person with great powers and abilities