true dwarf vs nanus

true dwarf and nanus both are nouns.

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

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

true 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 true dwarf include dwarf, midget.

true 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