midriff vs musculature

midriff and musculature both are nouns.

Word	Noun	Adjective	Verb	Adverb
midriff	Yes	No	No	No
musculature	Yes	No	No	No

As nouns, musculature is a hypernym of midriff; that is, musculature is a word with a broader meaning than midriff:

midriff: (anatomy) a muscular partition separating the abdominal and thoracic cavities; functions in respiration
musculature: the muscular system of an organism

Other hypernyms of midriff include membrane, tissue layer, muscle system, muscular structure.

midriff (noun)	musculature (noun)
(anatomy) a muscular partition separating the abdominal and thoracic cavities; functions in respiration	the muscular system of an organism
the middle area of the human torso (usually in front)