claim has 6 distinct synonyms spread across 6 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 2 recorded opposites are disclaim, forfeit.
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.
an assertion of a right (as to money or property)
“his claim asked for damages”
an assertion that something is true or factual
“his claim that he was innocent”
demand for something as rightful or due
“they struck in support of their claim for a shorter work day”
an established or recognized right
“a strong legal claim to the property”
ask for legally or make a legal claim to, as of debts, for example
“They claimed on the maximum allowable amount”
take as an undesirable consequence of some event or state of affairs
“the accident claimed three lives”
Synonyms, antonyms and the broader and narrower relations for claim come from Princeton University’s WordNet. Full sources and licences.