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roof has 2 distinct synonyms spread across 1 of its 5 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 protective covering that covers or forms the top of a building
Synonyms, antonyms and the broader and narrower relations for roof come from Princeton University’s WordNet. Full sources and licences.
protective covering on top of a motor vehicle
the inner top surface of a covered area or hollow space
“the roof of the cave was very high”
an upper limit on what is allowed
“he put a ceiling on the number of women who worked for him”