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energy has 12 distinct synonyms spread across 6 of its 7 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.
(physics) a thermodynamic quantity equivalent to the capacity of a physical system to do work; the units of energy are joules or ergs
“energy can take a wide variety of forms”
enterprising or ambitious drive
“Europeans often laugh at American energy”
an imaginative lively style (especially style of writing)
“his writing conveys great energy”
a healthy capacity for vigorous activity
“jogging works off my excess energy”
any source of usable power
“the DOE is responsible for maintaining the energy policy”
the federal department responsible for maintaining a national energy policy of the United States; created in 1977
Synonyms, antonyms and the broader and narrower relations for energy come from Princeton University’s WordNet. Full sources and licences.