Olympic Games vs Olympics

Olympic Games and Olympics both are nouns.

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

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

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

Other synonyms of Olympic Games include Olympiad.

Olympic Games (noun)	Olympics (noun)
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
the modern revival of the ancient games held once every 4 years in a selected country