pyriform lobe vs piriform lobe

pyriform lobe and piriform lobe both are nouns.

Word	Noun	Adjective	Verb	Adverb
pyriform lobe	Yes	No	No	No
piriform lobe	Yes	No	No	No

As nouns, pyriform lobe and piriform lobe are synonyms defined as:

pyriform lobe and piriform lobe: pear-shaped neural structure on either side of the brain in the rhinencephalon

Other synonyms of pyriform lobe include piriform area, pyriform area.

pyriform lobe (noun)	piriform lobe (noun)
pear-shaped neural structure on either side of the brain in the rhinencephalon	pear-shaped neural structure on either side of the brain in the rhinencephalon