infectious vs catching

infectious is not a noun while catching is a noun.

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

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

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