diencephalon vs thalmencephalon

diencephalon and thalmencephalon both are nouns.

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

As nouns, diencephalon and thalmencephalon are synonyms defined as:

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

Other synonyms of diencephalon include betweenbrain, interbrain.

diencephalon (noun)	thalmencephalon (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