Mammoth Uncensored Word List:
26 - 19 letter words starting with a

abdominohysterotomy accommodativenesses adrenocorticotropic adrenocorticotropin adventuresomenesses agammaglobulinemias anarchosyndicalists anatomicophysiology anatomopathological angiocardiographies anthropocentrically anthropomorphically anticholinesterases anticonservationist antidesertification antiferromagnetisms antifluoridationist antiparliamentarian antirevolutionaries antivivisectionists arachibutyrophobics archaeoastronomical archaeometallurgies astrophotographical authoritativenesses autotransplantation