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From letters P, L, A, I, N, T, I, V, E, N, E, S, S, E, S  I made following words

15 letter words

plaintivenesses[20]

13 letter words

plaintiveness[18]

12 letter words

venialnesses[15], nativenesses[15], pliantnesses[14], inessentials[12]

11 letter words

pensiveness[16], alivenesses[14], naivenesses[14], vitalnesses[14], planenesses[13], plainnesses[13], inaptnesses[13], ineptnesses[13], aliennesses[11], inessential[11], saintliness[11]

10 letter words

venialness[13], evilnesses[13], livenesses[13], vilenesses[13], vainnesses[13], venalities[13], levantines[13], valentines[13], nativeness[13], intensives[13], sensitives[13], svelteness[13], palenesses[12], sleepiness[12], penalities[12], septennial[12], epinasties[12], spleeniest[12], pliantness[12], epistasies[12], antisepses[12], antisepsis[12], inspissate[12], leannesses[10], latenesses[10], essentials[10], litenesses[10], steeliness[10], neatnesses[10], tininesses[10], silentness[10]

9 letter words

plaintive[14], passivist[14], aliveness[12], vaselines[12], naiveness[12], levantine[12], valentine[12], naiveties[12], lenitives[12], venenates[12], venetians[12], intensive[12], televises[12], vitalises[12], assentive[12], seventies[12], sensitive[12], eventless[12], vitalness[12], assistive[12], vistaless[12], penalises[11], planeness[11], plainness[11], penniless[11], spineless[11], spininess[11], antisleep[11], penalties[11], tapelines[11], sleepiest[11], panelists[11], alpinists[11], tailspins[11], inaptness[11], ineptness[11], epistases[11], epistasis[11], aptnesses[11], patnesses[11], steepness[11], pastiness[11], steapsins[11], tipsiness[11], alienness[9], selenates[9], essential[9], enlistees[9], selenites[9], alienists[9], antisense[9], insensate[9], einsteins[9], sentinels[9], sanitises[9], sensitise[9], staleness[9], saltiness[9], slatiness[9], stainless[9], tenseness[9], antsiness[9], nastiness[9]

8 letter words

vaseline[11], enlivens[11], enslaves[11], evilness[11], penalise[10], sepaline[10], enplanes[10], paleness[10], paneless[10], painless[10], spaniels[10], spinnies[10], pelisses[10], snapless[10], spanless[10], spinless[10], petaline[10], tapeline[10], epilates[10], panelist[10], pantiles[10], plainest[10], penlites[10], plenties[10], alpinist[10], antislip[10], pintails[10], tailspin[10], pentanes[10], pentenes[10], epitases[10], epeeists[10], seepiest[10], epitasis[10], tapeless[10], steeples[10], epistles[10], pitiless[10], steepens[10], sapients[10], steapsin[10], pianists[10], spiniest[10], plenists[10], tinsnips[10], pastises[10], pastless[10], pastness[10], pissants[10], alienees[8], anilines[8], leanness[8], silesias[8], easiness[8], saneness[8], selenate[8], enlistee[8], selenite[8], alienist[8], litanies[8], lenities[8], einstein[8], nineties[8], sentinel[8], steelies[8], etesians[8], teniases[8], isatines[8], sanities[8], sanitise[8], teniasis[8], sienites[8], lateness[8], elastins[8], nailsets[8], salients[8], saltines[8], liteness[8], setlines[8], neatness[8], insanest[8], stanines[8], tennises[8], tininess[8], seatless[8], sensates[8], sestinas[8], sestines[8], saltness[8]