We don't have synonyms for gennet yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are genet, jennet and bennet.
(n) :
Archaic form of genet (mammal). [Any of several Old World nocturnal, carnivorous mammals, of the genus Genetta, most of which have a spotted coat and a long, ringed tail.]
(n) :
Archaic form of genet (mammal). [Any of several Old World nocturnal, carnivorous mammals, of the genus Genetta, most of which have a spotted coat and a long, ringed tail.]