Mammoth Uncensored Word List:
65 - 16 letter words starting with an

anagrammatically anaphylactically anchoringgrounds anesthesiologies anesthesiologist aneurysmorrhaphy angiographically antagonistically antepenultimates anthropocentrism anthropomorphism anthropomorphist anthropomorphize anthropomorphous anthropopathisms antiabortionists antiangiogenesis antiaphrodisiacs antiaristocratic antiassimilation antibureaucratic anticarcinogenic anticholinergics anticipointments anticlericalisms anticlericalists anticolonialisms anticolonialists anticonglomerate anticonservation anticonventional antievolutionary antievolutionism antievolutionist antiferromagnets antihierarchical antihumanitarian antihypertensive antiinflammatory antiintellectual antilibertarians antimaterialisms antimaterialists antimetaphysical antimilitaristic antinationalists antiorganization antipathetically antiphospholipid antipornographic antiprofiteering antiprostitution antiracketeering antirationalisms antirationalists antirecessionary antireductionism antireductionist antiromanticisms antistrophically antitechnologies antitotalitarian antituberculosis antiunemployment antiuniversities