scoring vs grading

scoring and grading both are nouns.

Word	Noun	Adjective	Verb	Adverb
scoring	Yes	No	No	No
grading	Yes	No	No	No

As nouns, scoring and grading are synonyms defined as:

scoring and grading: evaluation of performance by assigning a grade or score

Other synonyms of scoring include marking.

scoring (noun)	grading (noun)
evaluation of performance by assigning a grade or score	the act of arranging in a graduated series
	evaluation of performance by assigning a grade or score
	changing the ground level to a smooth horizontal or gently sloping surface