colonnade vs arcade

colonnade and arcade both are nouns.

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

As nouns, colonnade and arcade are synonyms defined as:

colonnade and arcade: a structure composed of a series of arches supported by columns

colonnade (noun)	arcade (noun)
structure consisting of a row of evenly spaced columns	a structure composed of a series of arches supported by columns
a structure composed of a series of arches supported by columns	a covered passageway with shops and stalls on either side