loin vs lumbus

loin and lumbus both are nouns.

Word	Noun	Adjective	Verb	Adverb
loin	Yes	No	No	No
lumbus	Yes	No	No	No

As nouns, loin and lumbus are synonyms defined as:

loin and lumbus: either side of the backbone between the hipbone and the ribs in humans as well as quadrupeds

loin (noun)	lumbus (noun)
either side of the backbone between the hipbone and the ribs in humans as well as quadrupeds	either side of the backbone between the hipbone and the ribs in humans as well as quadrupeds
a cut of meat taken from the side and back of an animal between the ribs and the rump