ingress vs registration

ingress and registration both are nouns.

Word	Noun	Adjective	Verb	Adverb
ingress	Yes	No	No	No
registration	Yes	No	No	No

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

ingress (noun)	registration (noun)
the act of entering	the act of enrolling
(astronomy) the disappearance of a celestial body prior to an eclipse	the act of adjusting something to match a standard
	(music) the sound property resulting from a combination of organ stops used to perform a particular piece of music; the technique of selecting and adjusting organ stops
	a document certifying an act of registering
	the body of people (such as students) who register or enroll at the same time