sport kite vs stunt kite

sport kite and stunt kite both are nouns.

Word	Noun	Adjective	Verb	Adverb
sport kite	Yes	No	No	No
stunt kite	Yes	No	No	No

As nouns, sport kite and stunt kite are synonyms defined as:

sport kite and stunt kite: a maneuverable kite controlled by two lines and flown with both hands

sport kite (noun)	stunt kite (noun)
a maneuverable kite controlled by two lines and flown with both hands	a maneuverable kite controlled by two lines and flown with both hands