policyholder vs holder

policyholder and holder both are nouns.

Word	Noun	Adjective	Verb	Adverb
policyholder	Yes	No	No	No
holder	Yes	No	No	No

As nouns, holder is a hypernym of policyholder; that is, holder is a word with a broader meaning than policyholder:

policyholder: a person who holds an insurance policy; usually, the client in whose name an insurance policy is written
holder: a person who holds something

Other hypernyms of policyholder include client, customer.

policyholder (noun)	holder (noun)
a person who holds an insurance policy; usually, the client in whose name an insurance policy is written	a holding device
	the person who is in possession of a check or note or bond or document of title that is endorsed to him or to whoever holds it
	a person who holds something