sheltered workshop vs workshop

sheltered workshop and workshop both are nouns.

Word	Noun	Adjective	Verb	Adverb
sheltered workshop	Yes	No	No	No
workshop	Yes	No	No	No

As nouns, workshop is a hypernym of sheltered workshop; that is, workshop is a word with a broader meaning than sheltered workshop:

sheltered workshop: a workshop that offers jobs to members of the physically or developmentally disabled population
workshop: small workplace where handcrafts or manufacturing are done

Other hypernyms of sheltered workshop include shop.

sheltered workshop (noun)	workshop (noun)
a workshop that offers jobs to members of the physically or developmentally disabled population	a brief intensive course for a small group; emphasizes problem solving
	small workplace where handcrafts or manufacturing are done