friction

Synonyms: abrasion agitation attrition chafing erosion filing fretting grating grinding irritation massage rasping resistance scraping soreness traction trituration wearing away

Synonyms: animosity antagonism bad blood bad feeling bickering bone to pick conflict counteraction discontent discord disharmony dispute dissension faction factionalism flak hassle hatred hostility impedance incompatibility interference opposition quarrel resentment resistance rivalry row ruckus rumpus set-to sour note strife trouble wrangling

Antonyms: agreement harmony peace