mentum vs mental

mentum is a noun but mental is not a noun.

Word	Noun	Adjective	Verb	Adverb
mentum	Yes	No	No	No
mental	No	Yes	No	No

mentum (noun)	mental (noun)
a projection below the mouth of certain mollusks that resembles a chin
the protruding part of the lower jaw
a projection like a chin formed by the sepals and base of the column in some orchids

mentum (adjective)	mental (adjective)
	involving the mind or an intellectual process
	of or relating to the mind
	of or relating to the chin- or liplike structure in insects and certain mollusks
	of or relating to the chin or median part of the lower jaw
	affected by a disorder of the mind