muffle vs repress

muffle is a noun but repress is not a noun.

Word	Noun	Adjective	Verb	Adverb
muffle	Yes	No	Yes	No
repress	No	No	Yes	No

As verbs, muffle and repress are synonyms defined as:

Other synonyms of muffle include smother, stifle, strangle.

muffle (noun)	repress (noun)
a kiln with an inner chamber for firing things at a low temperature

muffle (verb)	repress (verb)
suppress in order to conceal or hide	block the action of
deaden (a sound or noise), especially by wrapping	put out of one's consciousness
	suppress in order to conceal or hide
	put down by force or intimidation
	impede or hinder the natural development or self-expression of