mutation vs deletion

mutation and deletion both are nouns.

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

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

mutation: (genetics) any event that changes genetic structure; any alteration in the inherited nucleic acid sequence of the genotype of an organism
deletion: (genetics) the loss or absence of one or more nucleotides from a chromosome

Other hyponyms of mutation include inversion, transposition, gene mutation, point mutation, reversion, saltation.

mutation (noun)	deletion (noun)
(genetics) any event that changes genetic structure; any alteration in the inherited nucleic acid sequence of the genotype of an organism	the act of deleting something written or printed
a change or alteration in form or qualities	the omission that is made when an editorial change shortens a written passage
(biology) an organism that has characteristics resulting from chromosomal alteration	(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