hindbrain vs rhombencephalon

hindbrain and rhombencephalon both are nouns.

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

As nouns, hindbrain and rhombencephalon are synonyms defined as:

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

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