passageway vs sinusoid

passageway and sinusoid both are nouns.

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

As nouns, sinusoid is a hyponym of passageway; that is, sinusoid is a word with a more specific, narrower meaning than passageway:

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

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