say vs mouth

say and mouth both are nouns.

Word	Noun	Adjective	Verb	Adverb
say	Yes	No	Yes	No
mouth	Yes	No	Yes	No

say (noun)	mouth (noun)
the chance to speak	the opening of a jar or bottle
	the externally visible part of the oral cavity on the face and the system of organs surrounding the opening
	the opening through which food is taken in and vocalizations emerge
	an impudent or insolent rejoinder
	the point where a stream issues into a larger body of water
	an opening that resembles a mouth (as of a cave or a gorge)
	a person conceived as a consumer of food
	a spokesperson (as a lawyer)

say (verb)	mouth (verb)
express in words	express in speech
report or maintain	articulate silently; form words with the lips only
speak, pronounce, or utter in a certain way	touch with the mouth
express a supposition
give instructions to or direct somebody to do something with authority
communicate or express nonverbally
recite or repeat a fixed text
indicate
state as one's opinion or judgement; declare
utter aloud
have or contain a certain wording or form