mouth vs declaim

mouth is a noun but declaim is not a noun.

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

mouth (noun)	declaim (noun)
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)

mouth (verb)	declaim (verb)
express in speech	recite in elocution
articulate silently; form words with the lips only	speak against in an impassioned manner
touch with the mouth