apology is one word that starts with a.
unusual
Some 7 letter S words are:salvagesauntersausagesandingscatterscamperscratchscuffleseasicksectionselfishsendingserioussessionshapelyshiftedsharpenshattershackleshakingsharingshimmershowingshuttershovelsshortlyshowersshuttlesickbedsizzledskilledskatingslammerslimmersmudgedsnaggedsnarledsnowmansnowingsnorkelsolvingsoldierspatterspecialspoiledsputterstaffedstaggerstalkerstarvedstammerstapledstationstartlestiffenstoragestressedstretchstingerstringystrikesstumblestutterstylishsubjectsublimesuctionsugaredsummarysupportsupposeswaggersweatersweeperswelterswingerswimmersyringe
babysitbackupbaggagebalanceballoonbankingbanquetbargainbashfulbathtubbarragebarrierbathingbatterybattingbeamingbearingbeastlybeatingbedsidebedroombecausebeddingbehavedbelievebelongsbellboybelovedbemusedbendingbeneathbenefitbequestbewitchbicyclebindingblanketblenderblinkerblisterblotchyblunderbondingbookletbracketbraverybrittlebroughtbrowserbuddingbusting
erraticerosion
CabbageCouragecapturecarnagecensurechemiseclimateclosurecombinecomparecompilecomputeconcavecondolecondoneconfineconfuseconjurecommodeconnoteconsoleconsumeconvenecorrodecottagecremate
Some seven letter words starting with B are:bathtubdisturbperturbproverbrhubarbsuccumbtaxicabwashtub
7 letter words I - T: * instant * imprint * inspect
Six letter words starting with the letter "T"ThreatThreadTinkerTimingTakingTeamedToppedTriple
RoundRafterRunnerRinkRealRenderRottenRankRooster
booming, banging, blaring
6 letter words starting and ending with N:napkinnationneuronnotion
No 7 letter words, but using 6 letters, words beginning with c, ending in s, are clouts and cutlets.