effort vs exercising

effort and exercising both are nouns.

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

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

effort: use of physical or mental energy; hard work
exercising: the activity of exerting your muscles in various ways to keep fit

effort (noun)	exercising (noun)
earnest and conscientious activity intended to do or accomplish something	the activity of exerting your muscles in various ways to keep fit
use of physical or mental energy; hard work
a notable achievement
a series of actions advancing a principle or tending toward a particular end