Erb's palsy vs paralysis

Erb's palsy and paralysis both are nouns.

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

As nouns, paralysis is a hypernym of Erb's palsy; that is, paralysis 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)
paralysis: loss of the ability to move a body part

Other hypernyms of Erb's palsy include palsy.

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