exertion vs application

exertion and application both are nouns.

Word	Noun	Adjective	Verb	Adverb
exertion	Yes	No	No	No
application	Yes	No	No	No

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

exertion (noun)	application (noun)
use of physical or mental energy; hard work	the action of putting something into operation
	a diligent effort
	the act of bringing something to bear; using it for a particular purpose
	the work of applying something
	liquid preparation having a soothing or antiseptic or medicinal action when applied to the skin
	a verbal or written request for assistance or employment or admission to a school
	a program that gives a computer instructions that provide the user with tools to accomplish a task