ethmoid sinus vs sinus ethmoidales

ethmoid sinus and sinus ethmoidales both are nouns.

Word	Noun	Adjective	Verb	Adverb
ethmoid sinus	Yes	No	No	No
sinus ethmoidales	Yes	No	No	No

As nouns, ethmoid sinus and sinus ethmoidales are synonyms defined as:

ethmoid sinus and sinus ethmoidales: a sinus of the meatuses of the nasal cavity (behind the bridge of the nose)

Other synonyms of ethmoid sinus include ethmoidal sinus.

ethmoid sinus (noun)	sinus ethmoidales (noun)
a sinus of the meatuses of the nasal cavity (behind the bridge of the nose)	a sinus of the meatuses of the nasal cavity (behind the bridge of the nose)