catching vs contractable

catching is a noun but contractable is not a noun.

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

As adjectives, catching and contractable are synonyms defined as:

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

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

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

catching (adjective)	contractable (adjective)
(of disease) capable of being transmitted by infection	(of disease) capable of being transmitted by infection