windward has 1 distinct synonym spread across 1 of its 4 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 leeward.
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.
the direction from which the wind is coming
on the side exposed to the wind
“the windward islands”
Synonyms, antonyms and the broader and narrower relations for windward come from Princeton University’s WordNet. Full sources and licences.