Amphitheatrum Flavium vs Colosseum

Amphitheatrum Flavium and Colosseum both are nouns.

Word	Noun	Adjective	Verb	Adverb
Amphitheatrum Flavium	Yes	No	No	No
Colosseum	Yes	No	No	No

As nouns, Amphitheatrum Flavium and Colosseum are synonyms defined as:

Amphitheatrum Flavium and Colosseum: a large amphitheater in Rome whose construction was begun by Vespasian about AD 75 or 80

Amphitheatrum Flavium (noun)	Colosseum (noun)
a large amphitheater in Rome whose construction was begun by Vespasian about AD 75 or 80	a large amphitheater in Rome whose construction was begun by Vespasian about AD 75 or 80