refrain vs mortify

refrain is a noun but mortify is not a noun.

Word	Noun	Adjective	Verb	Adverb
refrain	Yes	No	Yes	No
mortify	No	No	Yes	No

refrain (noun)	mortify (noun)
the part of a song where a soloist is joined by a group of singers

refrain (verb)	mortify (verb)
choose not to consume	undergo necrosis
resist doing something	cause to feel shame; hurt the pride of
	hold within limits and control
	practice self-denial of one's body and appetites