scaling vs grading

scaling and grading both are nouns.

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

As nouns, scaling and grading are synonyms defined as:

scaling (noun)	grading (noun)
act of measuring or arranging or adjusting according to a scale	the act of arranging in a graduated series
the act of arranging in a graduated series	evaluation of performance by assigning a grade or score
ascent by or as if by a ladder	changing the ground level to a smooth horizontal or gently sloping surface