penalty free throw vs free throw

penalty free throw and free throw both are nouns.

Word	Noun	Adjective	Verb	Adverb
penalty free throw	Yes	No	No	No
free throw	Yes	No	No	No

As nouns, penalty free throw and free throw are synonyms defined as:

penalty free throw and free throw: an unhindered basketball shot from the foul line; given to penalize the other team for committing a foul

Other synonyms of penalty free throw include charity shot, charity throw, charity toss, foul shot.

penalty free throw (noun)	free throw (noun)
an unhindered basketball shot from the foul line; given to penalize the other team for committing a foul	an unhindered basketball shot from the foul line; given to penalize the other team for committing a foul