immersion vs baptism

immersion and baptism both are nouns.

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

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

immersion: a form of baptism in which part or all of a person's body is submerged
baptism: a Christian sacrament signifying spiritual cleansing and rebirth

immersion (noun)	baptism (noun)
a form of baptism in which part or all of a person's body is submerged	a Christian sacrament signifying spiritual cleansing and rebirth
the act of wetting something by submerging it
complete attention; intense mental effort
sinking until covered completely with water
(astronomy) the disappearance of a celestial body prior to an eclipse