Term: rivulus: found in small streams of tropical America; often kept in aquariums; usually hermaphroditic
Candidate hypernym: teleost fish: a bony fish of the subclass Teleostei → 1
Candidate hypernym: ring-necked parakeet: African parakeet → 0
Candidate hypernym: skyline: the outline of objects seen against the sky → 0
Candidate hypernym: schwa: a neutral middle vowel; occurs in unstressed syllables → 0
Candidate hypernym: frostweed: perennial of the eastern United States having early solitary yellow flowers followed by late petalless flowers; so-called because ice crystals form on it during first frosts → 0
Candidate hypernym: hem: the utterance of a sound similar to clearing the throat; intended to get attention, express hesitancy, fill a pause, hide embarrassment, warn a friend, etc. → 0
Candidate hypernym: gazelle: small swift graceful antelope of Africa and Asia having lustrous eyes → 0
Candidate hypernym: implosion: a sudden inward collapse → 0
Candidate hypernym: cod-liver oil: an oil obtained from the livers of cod and similar fishes; taken orally as a source of vitamins A and D → 0
Candidate hypernym: collagenase: any enzyme that catalyzes the hydrolysis of collagen and gelatin → 0
Candidate hypernym: historical document: writing having historical value (as opposed to fiction or myth etc.) → 0