possessor vs holder

possessor and holder both are nouns.

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

As nouns, holder is a hyponym of possessor; that is, holder is a word with a more specific, narrower meaning than possessor:

Other hyponyms of possessor include homeowner, householder, part-owner, saver, shipowner.

possessor (noun)	holder (noun)
a person who owns something	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