effort vs rubbing

effort and rubbing both are nouns.

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

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

effort (noun)	rubbing (noun)
earnest and conscientious activity intended to do or accomplish something	effort expended in moving one object over another with pressure
use of physical or mental energy; hard work	representation consisting of a copy (as of an engraving) made by laying paper over something and rubbing it with charcoal
a notable achievement	the resistance encountered when one body is moved in contact with another
a series of actions advancing a principle or tending toward a particular end