diligent vs diligence

diligent is not a noun while diligence is a noun.

Word	Noun	Adjective	Verb	Adverb
diligent	No	Yes	No	No
diligence	Yes	No	No	No

diligent (noun)	diligence (noun)
	a diligent effort
	persevering determination to perform a task
	conscientiousness in paying proper attention to a task; giving the degree of care required in a given situation

diligent (adjective)	diligence (adjective)
characterized by care and perseverance in carrying out tasks
quietly and steadily persevering especially in detail or exactness