hood has 13 distinct synonyms spread across 5 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. 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.
a tubular attachment used to keep stray light out of the lens of a camera
(falconry) a leather covering for a hawk's head
metal covering leading to a vent that exhausts smoke or fumes
protective covering consisting of a metal part that covers the engine
“there are powerful engines under the hoods of new cars”
(zoology) an expandable part or marking that resembles a hood on the head or neck of an animal
cover with a hood
“The bandits were hooded”
Synonyms, antonyms and the broader and narrower relations for hood come from Princeton University’s WordNet. Full sources and licences.