effort vs diligence

effort and diligence both are nouns.

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

As nouns, diligence is a hyponym of effort; that is, diligence is a word with a more specific, narrower meaning than effort:

effort (noun)	diligence (noun)
earnest and conscientious activity intended to do or accomplish something	a diligent effort
use of physical or mental energy; hard work	persevering determination to perform a task
a notable achievement	conscientiousness in paying proper attention to a task; giving the degree of care required in a given situation
a series of actions advancing a principle or tending toward a particular end