technique has 1 distinct synonym spread across 1 of its 2 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.
a practical method or art applied to some particular task
Synonyms, antonyms and the broader and narrower relations for technique come from Princeton University’s WordNet. Full sources and licences.
skillfulness in the command of fundamentals deriving from practice and familiarity
“practice greatly improves proficiency”