Peter's gland vs lymph node

Peter's gland and lymph node both are nouns.

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

As nouns, lymph node is a hypernym of Peter's gland; that is, lymph node 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 node: the source of lymph and lymphocytes

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

Peter's gland (noun)	lymph node (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