Peter's gland vs lymph gland

Peter's gland and lymph gland both are nouns.

Word	Noun	Adjective	Verb	Adverb
Peter's gland	Yes	No	No	No
lymph gland	Yes	No	No	No

As nouns, lymph gland is a hypernym of Peter's gland; that is, lymph gland is a word with a broader meaning than Peter's gland:

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

Other hypernyms of Peter's gland include lymph node, node.

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