pill roller vs caregiver

pill roller and caregiver both are nouns.

Word	Noun	Adjective	Verb	Adverb
pill roller	Yes	No	No	No
caregiver	Yes	No	No	No

As nouns, caregiver is a hypernym of pill roller; that is, caregiver is a word with a broader meaning than pill roller:

pill roller: a health professional trained in the art of preparing and dispensing drugs
caregiver: a person who helps in identifying or preventing or treating illness or disability

Other hypernyms of pill roller include health care provider, health professional, PCP, primary care provider.

pill roller (noun)	caregiver (noun)
a health professional trained in the art of preparing and dispensing drugs	a person who is responsible for attending to the needs of a child or dependent adult
	a person who helps in identifying or preventing or treating illness or disability