ping-pong table vs pingpong table

ping-pong table and pingpong table both are nouns.

Word	Noun	Adjective	Verb	Adverb
ping-pong table	Yes	No	No	No
pingpong table	Yes	No	No	No

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

ping-pong table and pingpong table: a table used for playing table tennis

Other synonyms of ping-pong table include table-tennis table.

ping-pong table (noun)	pingpong table (noun)
a table used for playing table tennis	a table used for playing table tennis