passageway vs arcade

passageway and arcade both are nouns.

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

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

Other hyponyms of passageway include aisle, gangway, areaway, corridor, drift, gallery, heading, gangway, gate, shaft, tunnel, walk-through.

passageway (noun)	arcade (noun)
a passage between rooms or between buildings	a structure composed of a series of arches supported by columns
a path or channel or duct through or along which something may pass	a covered passageway with shops and stalls on either side