sinus vs passageway

sinus and passageway both are nouns.

Word	Noun	Adjective	Verb	Adverb
sinus	Yes	No	No	No
passageway	Yes	No	No	No

As nouns, passageway is a hypernym of sinus; that is, passageway is a word with a broader meaning than sinus:

sinus: an abnormal passage leading from a suppurating cavity to the body surface
passageway: a path or channel or duct through or along which something may pass

Other hypernyms of sinus include passage.

sinus (noun)	passageway (noun)
a wide channel containing blood; does not have the coating of an ordinary blood vessel	a passage between rooms or between buildings
any of various air-filled cavities especially in the bones of the skull	a path or channel or duct through or along which something may pass
an abnormal passage leading from a suppurating cavity to the body surface