content has 11 distinct synonyms spread across 7 of its 10 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 discontent.
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.
(usually plural) everything that is included in a collection and that is held or included in something
“he emptied the contents of his pockets”
what a communication that is about something is about
the proportion of a substance that is contained in a mixture or alloy etc.
the amount that can be contained
“the gas tank has a capacity of 12 gallons”
the state of being contented with your situation in life
“he relaxed in sleepy contentedness”
something (a person or object or scene) selected by an artist or photographer for graphic representation
“a moving picture of a train is more dramatic than a still picture of the same subject”
satisfy in a limited way
“He contented himself with one glass of beer per day”
make content
“I am contented”
Synonyms, antonyms and the broader and narrower relations for content come from Princeton University’s WordNet. Full sources and licences.