grading vs leveling

grading and leveling both are nouns.

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

As nouns, grading and leveling are synonyms defined as:

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

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