mentum vs plant structure

mentum and plant structure both are nouns.

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

As nouns, plant structure is a hypernym of mentum; that is, plant structure 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 structure: any part of a plant or fungus

Other hypernyms of mentum include plant part.

mentum (noun)	plant structure (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