pterygoid plexus vs plexus

pterygoid plexus and plexus both are nouns.

Word	Noun	Adjective	Verb	Adverb
pterygoid plexus	Yes	No	No	No
plexus	Yes	No	No	No

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

pterygoid plexus: a plexus of veins draining the region of the pterygoid muscles and draining into the internal maxillary and anterior facial veins
plexus: a network of intersecting blood vessels or intersecting nerves or intersecting lymph vessels

Other hypernyms of pterygoid plexus include rete.

pterygoid plexus (noun)	plexus (noun)
a plexus of veins draining the region of the pterygoid muscles and draining into the internal maxillary and anterior facial veins	a network of intersecting blood vessels or intersecting nerves or intersecting lymph vessels