thalmencephalon vs diencephalon

thalmencephalon and diencephalon both are nouns.

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

As nouns, thalmencephalon and diencephalon are synonyms defined as:

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

Other synonyms of thalmencephalon include betweenbrain, interbrain.

thalmencephalon (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