List of 15-letter words containing FF

AFFIRMATIVENESS AFFORESTATIONAL AFFRANCHISEMENT AFFUSEDAFFUSING CORTICOAFFERENT CORTICOEFFERENT DEAFFORESTATION DEDIFFERENTIATE DIFFERENTIALIZE DIFFERENTIATING DIFFERENTIATION DIFFERENTIATIVE DIFFERENTIATORS DIFFRACTIVENESS DIFFRANGIBILITY DISAFFECTEDNESS DISAFFECTIONATE DISAFFILIATIONS DISAFFORESTMENT EFFICACIOUSNESS EFFRANCHISEMENT ELECTROAFFINITY EQUISUFFICIENCY HANDKERCHIEFFUL IMMUNODIFFUSION INDIFFERENTNESS INEFFACEABILITY INEFFECTIVENESS INEFFECTUALNESS INEFFERVESCENCE INEFFERVESCIBLE INEFFICACIOUSLY INOFFENSIVENESS INOFFICIOUSNESS INSUFFICIENCIES INTERAFFILIATED INTERTRAFFICKED JEFFERSONIANISM NONEFFERVESCENT NONEFFUSIVENESS NONOFFICEHOLDER OFFENSELESSNESS OFFICIALISATION OFFICIALIZATION OMNISUFFICIENCY OVERAFFIRMATION OVERAFFIRMATIVE OVERDIFFUSENESS OVERDIFFUSINGLY OVEROFFENSIVELY OVEROFFICIOUSLY OVERSUFFICIENCY PECKSNIFFIANISM POLYAFFECTIONED PRESUFFICIENTLY REAFFORESTATION REDIFFERENTIATE SELFSUFFICIENCY STANDOFFISHNESS STIFFNECKEDNESS SUPERAFFLUENTLY SUPEREFFLUENTLY SUPERSUFFICIENT THERMODIFFUSION TRAFFICABLENESS UNAFFLICTEDNESS UNBELIEFFULNESS UNDIFFRACTIVELY UNDIFFUSIVENESS UNEFFECTIVENESS UNEFFECTUALNESS UNEFFICACIOUSLY UNINDIFFERENTLY UNOFFENSIVENESS UNOFFICIOUSNESS UNSUFFICINGNESS