interbrain vs diencephalon

interbrain and diencephalon both are nouns.

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

As nouns, interbrain and diencephalon are synonyms defined as:

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

Other synonyms of interbrain include betweenbrain, thalmencephalon.

interbrain (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