immersion vs wetting

immersion and wetting both are nouns.

Word	Noun	Adjective	Verb	Adverb
immersion	Yes	No	No	No
wetting	Yes	No	No	No

As nouns, wetting is a hypernym of immersion; that is, wetting is a word with a broader meaning than immersion:

immersion (noun)	wetting (noun)
a form of baptism in which part or all of a person's body is submerged	the act of making something wet
the act of wetting something by submerging it	a euphemism for urination
complete attention; intense mental effort
sinking until covered completely with water
(astronomy) the disappearance of a celestial body prior to an eclipse