Synonyms for Quintuplet (same or very similar meaning)
WordNet sense 1 (the cardinal number that is the sum of four and one):
fin, five, phoebe, quint, quintet, v, pentad, cinque, fivesome, Little PhoebeWordNet sense 2 (one of five children born at the same time from the same pregnancy):
quinWordNet sense 3 (a set of five similar things considered as a unit):
quintette, quintupleFrom the ODE community, based on WordNetadd/edit