primordial dwarf vs nanus

primordial dwarf and nanus both are nouns.

Word	Noun	Adjective	Verb	Adverb
primordial dwarf	Yes	No	No	No
nanus	Yes	No	No	No

As nouns, nanus is a hypernym of primordial dwarf; that is, nanus is a word with a broader meaning than primordial dwarf:

primordial dwarf: an achondroplastic dwarf whose small size is the result of a genetic defect; body parts and mental and sexual development are normal
nanus: a person who is markedly small

Other hypernyms of primordial dwarf include dwarf, midget.

primordial dwarf (noun)	nanus (noun)
an achondroplastic dwarf whose small size is the result of a genetic defect; body parts and mental and sexual development are normal	a person who is markedly small