navel vs midpoint

navel and midpoint both are nouns.

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

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

navel: 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 include center, centre.

navel (noun)	midpoint (noun)
a scar where the umbilical cord was attached	a point equidistant from the ends of a line or the extremities of a figure
the center point or middle of something