sinusoid vs passageway

sinusoid and passageway both are nouns.

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

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

sinusoid: tiny endothelium-lined passages for blood in the tissue of an organ
passageway: a path or channel or duct through or along which something may pass

Other hypernyms of sinusoid include passage.

sinusoid (noun)	passageway (noun)
tiny endothelium-lined passages for blood in the tissue of an organ	a passage between rooms or between buildings
the curve of y=sin x	a path or channel or duct through or along which something may pass