attention vs inattentive

attention is a noun but inattentive is not a noun.

Word	Noun	Adjective	Verb	Adverb
attention	Yes	No	No	No
inattentive	No	Yes	No	No

attention (noun)	inattentive (noun)
the work of providing treatment for or attending to someone or something
a courteous act indicating affection
a motionless erect stance with arms at the sides and feet together; assumed by military personnel during drill or review
the process whereby a person concentrates on some features of the environment to the (relative) exclusion of others
the faculty or power of mental concentration
a general interest that leads people to want to know more

attention (adjective)	inattentive (adjective)
	showing a lack of attention or care
	not showing due care or attention