plexus lumbalis vs nerve plexus

plexus lumbalis and nerve plexus both are nouns.

Word	Noun	Adjective	Verb	Adverb
plexus lumbalis	Yes	No	No	No
nerve plexus	Yes	No	No	No

As nouns, nerve plexus is a hypernym of plexus lumbalis; that is, nerve plexus is a word with a broader meaning than plexus lumbalis:

plexus lumbalis: a plexus of nerves formed by the ventral branches of the first four lumbar nerves
nerve plexus: a network of intersecting nerves

plexus lumbalis (noun)	nerve plexus (noun)
a plexus of nerves formed by the ventral branches of the first four lumbar nerves	a network of intersecting nerves
a lymphatic plexus located along the lower portion of the aorta and iliac vessels