WordNet records no synonym and no antonym for hatchery. It is the only member of its synset, which is common for technical, taxonomic and single-sense vocabulary — there is no other English word that means the same thing. The broader and narrower terms below are the useful relations in that case.
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 place where eggs are hatched under artificial conditions (especially fish eggs)
“the park authorities operated a trout hatchery”
Synonyms, antonyms and the broader and narrower relations for hatchery come from Princeton University’s WordNet. Full sources and licences.