axillary node vs lymph node

axillary node and lymph node both are nouns.

Word	Noun	Adjective	Verb	Adverb
axillary node	Yes	No	No	No
lymph node	Yes	No	No	No

As nouns, lymph node is a hypernym of axillary node; that is, lymph node is a word with a broader meaning than axillary node:

axillary node: any of the lymph glands of the armpit; fights infections in the neck and chest and arm regions
lymph node: the source of lymph and lymphocytes

Other hypernyms of axillary node include lymph gland, node.

axillary node (noun)	lymph node (noun)
any of the lymph glands of the armpit; fights infections in the neck and chest and arm regions	the source of lymph and lymphocytes