mentum vs plant part

mentum and plant part both are nouns.

Word	Noun	Adjective	Verb	Adverb
mentum	Yes	No	No	No
plant part	Yes	No	No	No

As nouns, plant part is a hypernym of mentum; that is, plant part is a word with a broader meaning than mentum:

mentum: a projection like a chin formed by the sepals and base of the column in some orchids
plant part: any part of a plant or fungus

Other hypernyms of mentum include plant structure.

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