ping pong vs table tennis

ping pong and table tennis both are nouns.

Word	Noun	Adjective	Verb	Adverb
ping pong	Yes	No	No	No
table tennis	Yes	No	No	No

As nouns, ping pong and table tennis are synonyms defined as:

ping pong and table tennis: a game (trademark Ping-Pong) resembling tennis but played on a table with paddles and a light hollow ball

Other synonyms of ping pong include Ping-Pong.

ping pong (noun)	table tennis (noun)
a game (trademark Ping-Pong) resembling tennis but played on a table with paddles and a light hollow ball	a game (trademark Ping-Pong) resembling tennis but played on a table with paddles and a light hollow ball