suspicious vs funny

suspicious is not a noun while funny is a noun.

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

As adjectives, suspicious and funny are synonyms defined as:

Other synonyms of suspicious include fishy, shady, suspect.

suspicious (noun)	funny (noun)
	an account of an amusing incident (usually with a punch line)

suspicious (adjective)	funny (adjective)
openly distrustful and unwilling to confide	arousing or provoking laughter
not as expected	experiencing odd bodily sensations
	not as expected
	beyond or deviating from the usual or expected