arbour vs pergola

arbour and pergola both are nouns.

Word	Noun	Adjective	Verb	Adverb
arbour	Yes	No	No	No
pergola	Yes	No	No	No

As nouns, arbour and pergola are synonyms defined as:

Other synonyms of arbour include arbor, bower.

arbour (noun)	pergola (noun)
a framework that supports climbing plants	a framework that supports climbing plants