Here's what rhymes with fastnessess.
assess less possess guess yes mess profess chess success press stress unless dress bless confess recess caress finesse oppress abbess reassess impress nonetheless suppress coalesce depress undress abs authoress egress largesse express nevertheless distress redress repress acquiesce transgress Words that almost rhyme with fastnessess
says chef death fresh flesh deaf mesh rev afresh ref neath breath refresh cortege sense sex hence sets offence thence fence offense chefs hex vex steps gets affects cents deaths debts dense helps whence checks scarce tense threats lets necks nets sects decks jets pence pets bets flex scents specks steppes upsets vents wrecks cassettes refs reps sweats thefts vests effects events tests defence defense depths guests immense rests accepts rents arrests belts commence convex incense nests suspense tents bayonets breaths chests desks epithets forgets melts pests temps tenths attests cadets adepts dents jests pelts rosettes attempts expense intense texts breasts lengths prevents cigarettes connects dialects directs dispense manifests protects suspects collects pretense selects clefts commonsense condense consents corrects crests elects intersects invests laments begets codex descents digests ferments infects intercepts invents minarets parapets perplex quests resents silhouettes statuettes tempts vignettes suggests represents reflects respects strengths expects rejects neglects regrets bequests detects intellects intents sixpence alphabets bottlenecks circumflex extents penitents quadriceps tempests transepts requests architects presidents recompense commonwealths multiplex quartets discontents malcontents