mutation vs reversion

mutation and reversion both are nouns.

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

As nouns, reversion is a hyponym of mutation; that is, reversion 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
reversion: (genetics) a return to a normal phenotype (usually resulting from a second mutation)

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

mutation (noun)	reversion (noun)
(genetics) any event that changes genetic structure; any alteration in the inherited nucleic acid sequence of the genotype of an organism	a failure to maintain a higher state
a change or alteration in form or qualities	turning in the opposite direction
(biology) an organism that has characteristics resulting from chromosomal alteration	returning to a former state
	(genetics) a return to a normal phenotype (usually resulting from a second mutation)
	a reappearance of an earlier characteristic
	(law) an interest in an estate that reverts to the grantor (or his heirs) at the end of some period (e.g., the death of the grantee)