catching vs infectious

catching is a noun but infectious is not a noun.

Word	Noun	Adjective	Verb	Adverb
catching	Yes	Yes	No	No
infectious	No	Yes	No	No

catching (noun)	infectious (noun)
(baseball) playing the position of catcher on a baseball team
the act of detecting something; catching sight of something
becoming infected

catching (adjective)	infectious (adjective)
(of disease) capable of being transmitted by infection	easily spread
	of or relating to infection
	caused by infection or capable of causing infection