keep has 28 distinct synonyms spread across 19 of its 25 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 lose, break.
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.
supply with room and board
“He is keeping three women in the guest cottage”
behave as expected during of holidays or rites
“Keep the commandments”
store or keep customarily
“Where do you keep your gardening tools?”
have as a supply
“I always keep batteries in the freezer”
hold and prevent from leaving
“The student was kept after school”
the financial means whereby one lives
“each child was expected to pay for their keep”
Synonyms, antonyms and the broader and narrower relations for keep come from Princeton University’s WordNet. Full sources and licences.
the main tower within the walls of a medieval castle or fortress