axillary cavity vs axilla

axillary cavity and axilla both are nouns.

Word	Noun	Adjective	Verb	Adverb
axillary cavity	Yes	No	No	No
axilla	Yes	No	No	No

As nouns, axillary cavity and axilla are synonyms defined as:

axillary cavity and axilla: the hollow under the arm where it is joined to the shoulder

Other synonyms of axillary cavity include armpit, axillary fossa.

axillary cavity (noun)	axilla (noun)
the hollow under the arm where it is joined to the shoulder	the hollow under the arm where it is joined to the shoulder