leveling vs grading

leveling and grading both are nouns.

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

As nouns, leveling and grading are synonyms defined as:

leveling and grading: changing the ground level to a smooth horizontal or gently sloping surface

leveling (noun)	grading (noun)
the act of making equal or uniform	the act of arranging in a graduated series
complete destruction of a building	evaluation of performance by assigning a grade or score
changing the ground level to a smooth horizontal or gently sloping surface	changing the ground level to a smooth horizontal or gently sloping surface