Olympics vs Olympic Games

Olympics and Olympic Games both are nouns.

Word	Noun	Adjective	Verb	Adverb
Olympics	Yes	No	No	No
Olympic Games	Yes	No	No	No

As nouns, Olympics and Olympic Games are synonyms defined as:

Olympics and Olympic Games: the modern revival of the ancient games held once every 4 years in a selected country

Other synonyms of Olympics include Olympiad.

Olympics (noun)	Olympic Games (noun)
the modern revival of the ancient games held once every 4 years in a selected country	the ancient Panhellenic celebration at Olympia in honor of Zeus; held every 4 years beginning in 776 BC
	the modern revival of the ancient games held once every 4 years in a selected country