Mammoth Uncensored Word List:
50 - 13 letter words starting with fa

facetectomies facetiousness facilitations factionalisms factionalists factorability factorisation factorization factualnesses facultatively faddishnesses fairnitickles fairnytickles faithlessness fallibilities falsification familiarisers familiarising familiarities familiarizers familiarizing fanaticalness fanfaronading fantasmically fantastically fantasticated fantasticates fantasticisms faradisations faradizations farawaynesses farcicalities farkleberries farnarkelings farthinglands fasciculately fasciculation fascinatingly fascistically fashionmonger fatefulnesses fatheadedness fatigableness fatuousnesses faultfindings faultlessness faunistically favorableness favorednesses fawningnesses