navel point vs midpoint

navel point and midpoint both are nouns.

Word	Noun	Adjective	Verb	Adverb
navel point	Yes	No	No	No
midpoint	Yes	No	No	No

As nouns, midpoint is a hypernym of navel point; that is, midpoint is a word with a broader meaning than navel point:

navel point: the center point or middle of something
midpoint: a point equidistant from the ends of a line or the extremities of a figure

Other hypernyms of navel point include center, centre.

navel point (noun)	midpoint (noun)
the center point or middle of something	a point equidistant from the ends of a line or the extremities of a figure