betweenbrain vs diencephalon

betweenbrain and diencephalon both are nouns.

Word	Noun	Adjective	Verb	Adverb
betweenbrain	Yes	No	No	No
diencephalon	Yes	No	No	No

As nouns, betweenbrain and diencephalon are synonyms defined as:

betweenbrain and diencephalon: the posterior division of the forebrain; connects the cerebral hemispheres with the mesencephalon

Other synonyms of betweenbrain include interbrain, thalmencephalon.

betweenbrain (noun)	diencephalon (noun)
the posterior division of the forebrain; connects the cerebral hemispheres with the mesencephalon	the posterior division of the forebrain; connects the cerebral hemispheres with the mesencephalon