rhombencephalon vs hindbrain

rhombencephalon and hindbrain both are nouns.

Word	Noun	Adjective	Verb	Adverb
rhombencephalon	Yes	No	No	No
hindbrain	Yes	No	No	No

As nouns, rhombencephalon and hindbrain are synonyms defined as:

rhombencephalon and hindbrain: the posterior portion of the brain including cerebellum and brainstem

rhombencephalon (noun)	hindbrain (noun)
the posterior portion of the brain including cerebellum and brainstem	the posterior portion of the brain including cerebellum and brainstem