free throw vs penalty free throw

free throw and penalty free throw both are nouns.

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

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

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

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

free throw (noun)	penalty 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