sacrifice has 4 distinct synonyms spread across 3 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.
the act of losing or surrendering something as a penalty for a mistake or fault or failure to perform etc.
personnel that are sacrificed (e.g., surrendered or lost in order to gain an objective)
Synonyms, antonyms and the broader and narrower relations for sacrifice come from Princeton University’s WordNet. Full sources and licences.
a loss entailed by giving up or selling something at less than its value
“he had to sell his car at a considerable sacrifice”
the act of killing (an animal or person) in order to propitiate a deity
(baseball) an out that advances the base runners
kill or destroy
“The animals were sacrificed after the experiment”