omphalos vs navel

omphalos and navel both are nouns.

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

As nouns, omphalos and navel are synonyms defined as:

Other synonyms of omphalos include belly button, bellybutton, omphalus, umbilicus.

omphalos (noun)	navel (noun)
a scar where the umbilical cord was attached	a scar where the umbilical cord was attached
	the center point or middle of something