"sixer" in the noun sense
1. six, 6, VI, sixer, sise, Captain Hicks, half a dozen, sextet, sestet, sextuplet, hexad
the cardinal number that is the sum of five and one
"sixer" in the adjective sense
1. six, 6, vi, half dozen, half-dozen
denoting a quantity consisting of six items or units
Source: WordNet® (An amazing lexical database of English)
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