WordNet sense 1 (the cardinal number that is the sum of five and one):

sextet, sextuplet, six, hexad, sestet, sise, sixer, Captain Hicks, half a dozen

WordNet sense 2 (more than 130 southeastern Virgin Islands; a dependent territory of the United States):

United States Virgin Islands, American Virgin Islands

WordNet sense 3 (denoting a quantity consisting of six items or units):

half-dozen, half dozen

WordNet sense 4 (being or denoting a numerical quantity but not order):

cardinal