funny vs suspicious

funny is a noun but suspicious is not a noun.

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

As adjectives, funny and suspicious are synonyms defined as:

Other synonyms of funny include fishy, shady, suspect.

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

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