suspicious vs suspicion

suspicious is not a noun while suspicion is a noun.

Word	Noun	Adjective	Verb	Adverb
suspicious	No	Yes	No	No
suspicion	Yes	No	No	No

suspicious (noun)	suspicion (noun)
	being of a suspicious nature
	doubt about someone's honesty
	an impression that something might be the case
	the state of being suspected

suspicious (adjective)	suspicion (adjective)
openly distrustful and unwilling to confide
not as expected