fracture has 7 distinct synonyms spread across 4 of its 9 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
violate or abuse
“This writer really fractures the language”
interrupt, break, or destroy
“fracture the balance of power”
break into pieces
“The pothole fractured a bolt on the axle”
Synonyms, antonyms and the broader and narrower relations for fracture come from Princeton University’s WordNet. Full sources and licences.
become fractured
“The tibia fractured from the blow of the iron pipe”
break (a bone)
“She broke her clavicle”
(geology) a crack in the earth's crust resulting from the displacement of one side with respect to the other
“they built it right over a geological fault”