pituitary dwarf vs nanus

pituitary dwarf and nanus both are nouns.

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

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

pituitary dwarf: a dwarf whose condition is caused by a deficiency of growth hormones, rather than by genetic factors (as in the case of the achondroplastic dwarf)
nanus: a person who is markedly small

Other hypernyms of pituitary dwarf include dwarf, midget.

pituitary dwarf (noun)	nanus (noun)
a dwarf whose condition is caused by a deficiency of growth hormones, rather than by genetic factors (as in the case of the achondroplastic dwarf)	a person who is markedly small