elbow grease(n = noun.act) effort, exertion, sweat, travail - use of physical or mental energy; hard work; "he got an A for effort"; "they managed only with great exertion"
is a kind of labor, labour, toil
has particulars: struggle, difficulty, trouble, least effort, least resistance, strain, straining, exercise, exercising, physical exercise, physical exertion, workout, pull, application, diligence, overkill, supererogation, overexertion, detrition, friction, rubbing

N  friction, attrition, rubbing, abrasion, scraping, confrication, detrition, contrition, affriction, abrasion, arrosion, limature, frication, rub, elbow grease, rosin, massage, roughness, rolling friction, sliding friction, starting friction, anatriptic, attrite.

axle grease, elbow, elbow bone, elbow joint, elbow pad, elbow room, goose grease, grease, grease cock, grease cup, grease gun, grease monkey, grease one's palms, grease the palm, grease the wheels, hair grease, human elbow, tennis elbow, wool grease