Erb's palsy vs palsy

Erb's palsy and palsy both are nouns.

Word	Noun	Adjective	Verb	Adverb
Erb's palsy	Yes	No	No	No
palsy	Yes	No	Yes	No

As nouns, palsy is a hypernym of Erb's palsy; that is, palsy is a word with a broader meaning than Erb's palsy:

Erb's palsy: paralysis of the arm resulting from injury to the brachial plexus (usually during childbirth)
palsy: loss of the ability to move a body part

Other hypernyms of Erb's palsy include paralysis.

Erb's palsy (noun)	palsy (noun)
paralysis of the arm resulting from injury to the brachial plexus (usually during childbirth)	loss of the ability to move a body part
	a condition marked by uncontrollable tremor

Erb's palsy (verb)	palsy (verb)
	affect with palsy