attention vs immersion

attention and immersion both are nouns.

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

As nouns, immersion is a hyponym of attention; that is, immersion is a word with a more specific, narrower meaning than attention:

attention (noun)	immersion (noun)
the work of providing treatment for or attending to someone or something	a form of baptism in which part or all of a person's body is submerged
a courteous act indicating affection	the act of wetting something by submerging it
a motionless erect stance with arms at the sides and feet together; assumed by military personnel during drill or review	complete attention; intense mental effort
the process whereby a person concentrates on some features of the environment to the (relative) exclusion of others	sinking until covered completely with water
the faculty or power of mental concentration	(astronomy) the disappearance of a celestial body prior to an eclipse
a general interest that leads people to want to know more