shelter has 2 distinct synonyms spread across 2 of its 7 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.
protective covering that provides protection from the weather
the condition of being protected
“they were huddled together for protection”
a way of organizing business to reduce the taxes it must pay on current earnings
invest (money) so that it is not taxable
Synonyms, antonyms and the broader and narrower relations for shelter come from Princeton University’s WordNet. Full sources and licences.