abdominal aorta vs aorta

abdominal aorta and aorta both are nouns.

Word	Noun	Adjective	Verb	Adverb
abdominal aorta	Yes	No	No	No
aorta	Yes	No	No	No

As nouns, aorta is a hypernym of abdominal aorta; that is, aorta is a word with a broader meaning than abdominal aorta:

abdominal aorta: a branch of the descending aorta
aorta: the large trunk artery that carries blood from the left ventricle of the heart to branch arteries

abdominal aorta (noun)	aorta (noun)
a branch of the descending aorta	the large trunk artery that carries blood from the left ventricle of the heart to branch arteries