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envelope has 1 distinct synonym spread across 1 of its 6 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 flat (usually rectangular) container for a letter, thin package, etc.
a curve that is tangent to each of a family of curves
a natural covering (as by a fluid)
“the spacecraft detected an envelope of gas around the comet”
the maximum operating capability of a system (especially an aircraft)
“test pilots try to push the envelope”
Synonyms, antonyms and the broader and narrower relations for envelope come from Princeton University’s WordNet. Full sources and licences.