lid has 4 distinct synonyms spread across 2 of its 3 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.
either of two folds of skin that can be moved to cover or open the eye
“his lids would stay open no longer”
a movable top or cover (hinged or separate) for closing the opening at the top of a box, chest, jar, pan, etc.
“he raised the piano lid”
Synonyms, antonyms and the broader and narrower relations for lid come from Princeton University’s WordNet. Full sources and licences.
headdress that protects the head from bad weather; has shaped crown and usually a brim