striving vs effort

striving and effort both are nouns.

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

As nouns, effort is a hypernym of striving; that is, effort is a word with a broader meaning than striving:

striving: an effortful attempt to attain a goal
effort: earnest and conscientious activity intended to do or accomplish something

Other hypernyms of striving include attempt, endeavor, endeavour, try.

striving (noun)	effort (noun)
an effortful attempt to attain a goal	earnest and conscientious activity intended to do or accomplish something
	use of physical or mental energy; hard work
	a notable achievement
	a series of actions advancing a principle or tending toward a particular end