archenteron vs cavum

archenteron and cavum both are nouns.

Word	Noun	Adjective	Verb	Adverb
archenteron	Yes	No	No	No
cavum	Yes	No	No	No

As nouns, cavum is a hypernym of archenteron; that is, cavum is a word with a broader meaning than archenteron:

archenteron: central cavity of the gastrula; becomes the intestinal or digestive cavity
cavum: (anatomy) a natural hollow or sinus within the body

Other hypernyms of archenteron include bodily cavity, cavity.

archenteron (noun)	cavum (noun)
central cavity of the gastrula; becomes the intestinal or digestive cavity	(anatomy) a natural hollow or sinus within the body