they are words that have two sounds to them
Savvy, letter, vacuum, and bubble have doubled letters.
vacuum
teamlakemaketakecakesakebakesacktackbackracktalemailsailsandhandlandrailtailpalewashcatsmatsvatshatslatedate
Savvy
There are letters, but no mail. There is a pool, but no water. There are books, but no paper. Basically, only double lettered words.
disappoint
Mist
Absentmindedness and misappropriation are words. They contain 16 letters.
innings
Eight lettered words beginning with Q:QuackeryQuackingQuackishQuaddingQuadrantQuaffingQuagmireQuailingQuainterQuaintlyQuakiestQualmishQuandaryQuantifyQuantileQuantityQuantizeQuarrelsQuarriedQuarrierQuarriesQuartersQuartetsQuarticsQuartileQuartzesQuashingQuatrainQuaveredQuaysideQueasierQueasilyQueeningQueerestQueeringQuellingQuenchedQuencherQuenchesQueryingQuestersQuestingQuestionQuetzalsQuibbledQuibblerQuibblesQuickensQuickestQuickiesQuietensQuietestQuietingQuietudeQuillingQuiltersQuiltingQuininesQuintetsQuintileQuippingQuipsterQuirkierQuirkingQuirtingQuittersQuittingQuiveredQuixoticQuizzersQuizzingQuoiningQuoitingQuotableQuotient
Four lettered words ending with A:ActaAgnaAlbaAlfaAlgaAliaAlmaAniaAnnaAntaAnyaApiaAquaAreaAriaAseaAsiaAuraBajaBetaBolaBonaBoraBotaBriaCaraCasaCecaCocaCodaColaComaCoraDadaDataDevaDitaDivaDonaDopaEtnaFetaFinaFleaGalaHulaIdeaIngaIonaKajaLavaLetaLimaLiraLonaMamaMegaMesaMetaMinaMiraMonaNonaOkraOonaOrcaPetaPicaPleaProaPumaRajaRetaRonaSekaSelaSenaSetaTanaTaraThiaTomaTovaVinaVitaVivaYumaZetaPikaUreaUvea
Fray, flay. fury
Four letter words that begin with the letter u:uglyumpsundounituntouponurgeurnsuseduseruses