Mammoth Uncensored Word List:
59 words ending with ar, 13 letters long

circumstellar equimolecular extracapsular extracellular extramuscular extravascular fibrovascular hepatojugular hyomandibular hypervascular intercellular intercolumnar intergranular intermuscular interpetiolar interscapular intracapsular intracellular intramuscular intrapetiolar intravascular macrocellular microcellular microgranular microvascular monoarticular monomolecular multicellular neurofibrilar neuromuscular neurovascular nonfollicular nonlenticular nonmandibular oromandibular ovotesticular periarticular periauricular periglandular peritonsillar perpendicular polyarticular polyglandular precerebellar premandibular quadrilocular stereoregular subclavicular sublenticular submandibular subtriangular supercolumnar sustentacular thermonuclear tintinnabular transcellular tritubercular ultrafamiliar unspectacular