real tennis vs court tennis

real tennis and court tennis both are nouns.

Word	Noun	Adjective	Verb	Adverb
real tennis	Yes	No	No	No
court tennis	Yes	No	No	No

As nouns, real tennis and court tennis are synonyms defined as:

real tennis and court tennis: an ancient form of tennis played in a four-walled court

Other synonyms of real tennis include royal tennis.

real tennis (noun)	court tennis (noun)
an ancient form of tennis played in a four-walled court	an ancient form of tennis played in a four-walled court