catching vs spotting

catching and spotting both are nouns.

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

As nouns, catching and spotting are synonyms defined as:

catching and spotting: the act of detecting something; catching sight of something

Other synonyms of catching include detection, espial, spying.

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

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