thrush (n.1) Look up thrush at Dictionary.com
type of songbird, Old English þræsce, variant of þrysce, from Proto-Germanic *thruskjon (cognates: Old Norse þröstr, Norwegian trost, Old High German drosca), from PIE *trozdo- (cognates: Latin turdus, Lithuainian strazdas "thrush," Middle Irish truid, Welsh drudwy "starling," Old Church Slavonic drozgu, Russian drozdu).
thrush (n.2) Look up thrush at Dictionary.com
throat disease, 1660s, probably from a Scandinavian source (such as Norwegian, Danish trøske, Swedish torsk), but its roots and original meaning are unclear.