demand has 10 distinct synonyms spread across 4 of its 11 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. Its one recorded opposite is supply.
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.
ask to be informed of
“I demand an explanation”
an urgent or peremptory request
“his demands for attention were unceasing”
Synonyms, antonyms and the broader and narrower relations for demand come from Princeton University’s WordNet. Full sources and licences.
the ability and desire to purchase goods and services
“the automobile reduced the demand for buggywhips”
required activity
“the requirements of his work affected his health”