aortic aneurysm vs AAA

aortic aneurysm and AAA both are nouns.

Word	Noun	Adjective	Verb	Adverb
aortic aneurysm	Yes	No	No	No
AAA	Yes	No	No	No

As nouns, AAA is a hyponym of aortic aneurysm; that is, AAA is a word with a more specific, narrower meaning than aortic aneurysm:

aortic aneurysm: an aneurysm of the aorta
AAA: an aneurysm of the abdominal aorta associated with old age and hypertension

Other hyponyms of aortic aneurysm include abdominal aortic aneurysm.

aortic aneurysm (noun)	AAA (noun)
an aneurysm of the aorta	an aneurysm of the abdominal aorta associated with old age and hypertension