paleencephalon vs paleoencephalon

paleencephalon and paleoencephalon both are nouns.

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

As nouns, paleencephalon and paleoencephalon are synonyms defined as:

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

Other synonyms of paleencephalon include palaeencephalon.

paleencephalon (noun)	paleoencephalon (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