The term 'PARTNER OF FEATHERS' can be solved by two crossword solutions: TAR (3 letters) and TARS (4 letters). TAR is a black, sticky substance made from the distillation of wood and coal. It is used in many applications, including waterproofing, roofing, and road surfacing. TARS is an acronym for Technical Analysis and Research Services, which is a consulting firm that provides technical and research services to the government and private sector.