diligence vs diligent

diligence is a noun but diligent is not a noun.

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

diligence (noun)	diligent (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

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