Mammoth Uncensored Word List:
24 words ending with ra, 11 letters long

abracadabra acidanthera chaulmoogra chiliahedra dodecahedra entoplastra grandiflora hymenoptera hypoplastra lepidoptera liriodendra mangalsutra maquiladora microcamera pachysandra philodendra pyritohedra rejoneadora retinispora retinospora rhombohedra scolopendra taratantara videocamera