Open English Wordnet
Nouns
(n)navel, umbilicus, bellybutton, belly button, omphalos, omphalusa scar where the umbilical cord was attached“you were not supposed to show your navel on television”, “they argued whether or not Adam had a navel”, “she had a tattoo just above her bellybutton”
(n)navel, navel pointthe center point or middle of something“the Incas believed that Cuzco was the navel of the universe”