rag doll vs dolly

rag doll and dolly both are nouns.

Word	Noun	Adjective	Verb	Adverb
rag doll	Yes	No	No	No
dolly	Yes	No	No	No

As nouns, dolly is a hypernym of rag doll; that is, dolly is a word with a broader meaning than rag doll:

Other hypernyms of rag doll include doll.

rag doll (noun)	dolly (noun)
a cloth doll that is stuffed and (usually) painted	a small replica of a person; used as a toy
	conveyance consisting of a wheeled platform for moving heavy objects
	conveyance consisting of a wheeled support on which a camera can be mounted