passage vs cul de sac

passage and cul de sac both are nouns.

Word	Noun	Adjective	Verb	Adverb
passage	Yes	No	No	No
cul de sac	Yes	No	No	No

As nouns, cul de sac is a hyponym of passage; that is, cul de sac is a word with a more specific, narrower meaning than passage:

Other hyponyms of passage include adit, aisle, channel, conduit, cul, dead end, fish ladder, passageway, right of way, shaft, throat.

passage (noun)	cul de sac (noun)
a journey usually by ship	a street with only one way in or out
the passing of a law by a legislative body	a passage with access only at one end
the act of passing something to another person
the act of passing from one state or place to the next
a bodily reaction of changing from one place or stage to another
a way through or along which someone or something may pass
a path or channel or duct through or along which something may pass
a section of text; particularly a section of medium length
a short section of a musical composition
the motion of one object relative to another