information processing system vs compatible

information processing system is a noun but compatible is not a noun.

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

information processing system (noun)	compatible (noun)
a machine for performing calculations automatically

information processing system (adjective)	compatible (adjective)
	able to exist and perform in harmonious or agreeable combination
	capable of being used with or connected to other devices or components without modification
	capable of forming a homogeneous mixture that neither separates nor is altered by chemical interaction