classical architecture vs Graeco-Roman architecture

classical architecture and Graeco-Roman architecture both are nouns.

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

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

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

Other synonyms of classical architecture include Greco-Roman architecture.

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