Peter's gland vs Peyer's patch

Peter's gland and Peyer's patch both are nouns.

Word	Noun	Adjective	Verb	Adverb
Peter's gland	Yes	No	No	No
Peyer's patch	Yes	No	No	No

As nouns, Peter's gland and Peyer's patch are synonyms defined as:

Peter's gland and Peyer's patch: any of several lymph nodes in the walls of the intestines near the junction of the ileum and colon

Peter's gland (noun)	Peyer's patch (noun)
any of several lymph nodes in the walls of the intestines near the junction of the ileum and colon	any of several lymph nodes in the walls of the intestines near the junction of the ileum and colon