keyboard vs holder

keyboard and holder both are nouns.

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

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

keyboard: holder consisting of an arrangement of hooks on which keys or locks can be hung
holder: a holding device

keyboard (noun)	holder (noun)
holder consisting of an arrangement of hooks on which keys or locks can be hung	a holding device
device consisting of a set of keys on a piano or organ or typewriter or typesetting machine or computer or the like	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