doublet
dou.blet \'d*b-l*t\ n [ME, fr. MF, fr. double] 1: a man's close-fitting jacket worn in Europe esp. during the Renaissance 2a1: something consisting of two identical or similar parts 2a2: a set of two identical or similar things; specif : two thrown dice with the same number of spots on the upper face 2b: one of a pair; specif : one of two or more words (as guardX and ward) in the same language derived by different routes of transmission from the same source