keyboard vs information processing system

keyboard and information processing system both are nouns.

Word	Noun	Adjective	Verb	Adverb
keyboard	Yes	No	No	No
information processing system	Yes	No	No	No

keyboard (noun)	information processing system (noun)
holder consisting of an arrangement of hooks on which keys or locks can be hung	a machine for performing calculations automatically
device consisting of a set of keys on a piano or organ or typewriter or typesetting machine or computer or the like