catching vs communicable

catching is a noun but communicable is not a noun.

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

As adjectives, catching and communicable are synonyms defined as:

catching and communicable: (of disease) capable of being transmitted by infection

Other synonyms of catching include contagious, contractable, transmissible, transmittable.

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

catching (adjective)	communicable (adjective)
(of disease) capable of being transmitted by infection	readily communicated
	(of disease) capable of being transmitted by infection