sheep vs simpleton

sheep and simpleton both are nouns.

Word	Noun	Adjective	Verb	Adverb
sheep	Yes	No	No	No
simpleton	Yes	No	No	No

As nouns, simpleton is a hypernym of sheep; that is, simpleton is a word with a broader meaning than sheep:

Other hypernyms of sheep include simple.

sheep (noun)	simpleton (noun)
woolly usually horned ruminant mammal related to the goat	a person lacking intelligence or common sense
a docile and vulnerable person who would rather follow than make an independent decision
a timid defenseless simpleton who is readily preyed upon