removal vs deletion

removal and deletion both are nouns.

Word	Noun	Adjective	Verb	Adverb
removal	Yes	No	No	No
deletion	Yes	No	No	No

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

removal (noun)	deletion (noun)
the act of removing	the act of deleting something written or printed
dismissal from office	the omission that is made when an editorial change shortens a written passage
	(genetics) the loss or absence of one or more nucleotides from a chromosome
	any process whereby sounds or words are left out of spoken words or phrases