We don't have synonyms for supersister yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are supersystem, persister and supertwister.
(n) :
(biology) Any of a set of sisters of a haplodiploid species (e.g. honeybee, or any Hymenoptera) who are daughters of the same queen that was inseminated by a single male (drone). By contrast, full sisters of a diploid species (e.g. humans) share a genetic coefficient of relatedness of 0.5. Supersisters share 0.75 relatedness.
(n) :
(biology) Any of a set of sisters of a haplodiploid species (e.g. honeybee, or any Hymenoptera) who are daughters of the same queen that was inseminated by a single male (drone). By contrast, full sisters of a diploid species (e.g. humans) share a genetic coefficient of relatedness of 0.5. Supersisters share 0.75 relatedness.