Let's terminate these silly questions.
A word is Terminate.
armistice
peacetime
Nine letter words that begin and end with the same letter:beachcombdartboarddecimateddecorateddecreaseddefrostedeffectiveeradicateetiquetteexecutivefireproofflagstafffoolproofgatheringgroundhoghairbrushhopscotchhundredthmagnesiummidstreamnarrationnewswomannightgownnutritionrainwaterrecruitersailboatssentencesturbulent
termination
end
kill
B'ahava באהבה.
finality
Apparently the only common word is wheelbase.
Some nine letter words that start and end with the letter E are:economizeeffectiveeffluenceelaborateelectrodeeliminateeloquenceemergenceempathizeemphasizeenduranceentourageenunciateepitomizeequitableeradicateevaporateevocativeexcessiveexfoliateexquisite
A suffix is a letter or group of letters added to the end of a word to change its meaning or create a new word. It is typically added after the root or base word.
Teapot, it starts with the letter T, it has 'T' (meaning, tea) in the inside, and the letter T at the end.
5 nine letter words ending in FF:FlagstaffFoodstuffPikestaffPlaintiffWaitstaff
Some six letter words that end in double letters:accessacrossapogeebamboobefallboo booboohoobungeebypasscaresscoffeecouleecuckoodecreedegreeduressegressembossenrollentreeexcessgoateeharassHawaiilayofflycheemorassmuumuupayoffpeeweepizazzrebuffrecallrecessrefillremissripoffrunoffscrollscruffsetteeshrillsoireesquallstressstrolltarifftattoothrilltoffeetoupeeunlessvoodoo