registration vs enrolment

registration and enrolment both are nouns.

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

As nouns, registration and enrolment are synonyms defined as:

Other synonyms of registration include enrollment.

registration (noun)	enrolment (noun)
the act of enrolling	the act of enrolling
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