paleoencephalon vs paleencephalon

paleoencephalon and paleencephalon both are nouns.

Word	Noun	Adjective	Verb	Adverb
paleoencephalon	Yes	No	No	No
paleencephalon	Yes	No	No	No

As nouns, paleoencephalon and paleencephalon are synonyms defined as:

paleoencephalon and paleencephalon: the more primitive parts of the brain phylogenetically; most structures other than the cerebral cortex

Other synonyms of paleoencephalon include palaeencephalon.

paleoencephalon (noun)	paleencephalon (noun)
the more primitive parts of the brain phylogenetically; most structures other than the cerebral cortex	the more primitive parts of the brain phylogenetically; most structures other than the cerebral cortex