Graeco-Roman architecture vs classical architecture

Graeco-Roman architecture and classical architecture both are nouns.

Word	Noun	Adjective	Verb	Adverb
Graeco-Roman architecture	Yes	No	No	No
classical architecture	Yes	No	No	No

As nouns, Graeco-Roman architecture and classical architecture are synonyms defined as:

Graeco-Roman architecture and classical architecture: architecture influenced by the ancient Greeks or Romans

Other synonyms of Graeco-Roman architecture include Greco-Roman architecture.

Graeco-Roman architecture (noun)	classical architecture (noun)
architecture influenced by the ancient Greeks or Romans	architecture influenced by the ancient Greeks or Romans