colonnade vs loggia

colonnade and loggia both are nouns.

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

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

colonnade: a structure composed of a series of arches supported by columns
loggia: a roofed arcade or gallery with open sides stretching along the front or side of a building; often at an upper level

colonnade (noun)	loggia (noun)
structure consisting of a row of evenly spaced columns	a roofed arcade or gallery with open sides stretching along the front or side of a building; often at an upper level
a structure composed of a series of arches supported by columns