arena vs scene of action

arena and scene of action both are nouns.

Word	Noun	Adjective	Verb	Adverb
arena	Yes	No	No	No
scene of action	Yes	No	No	No

As nouns, arena and scene of action are synonyms defined as:

arena and scene of action: a playing field where sports events take place

arena (noun)	scene of action (noun)
a playing field where sports events take place	a playing field where sports events take place
a large structure for open-air sports or entertainments
the central area of an ancient Roman amphitheater where contests and spectacles were held; especially an area that was strewn with sand
a particular environment or walk of life