ill, inn, add, ass, all, Ann, odd, off, ebb, err, egg
For example
coffeetoffeecommittee
It determines the pronunciation.
Aardvark and eel are words. They begin with double letters.
Not many words begin with double letters. A few of those that do start with double letters include aardvark, eel, eerie, llama, ooh, oomph and ooze.
One of the longest words with double letters is "bookkeeper," which has three sets of double letters (oo, kk, ee). Another contender is "bookkeeping," which also features the same double letters. Both words are commonly cited in discussions about words with repeating letters.
Raccoon is a word. It includes double letters in a row.
Some ways are to do it by syllables, prefixes/suffixes, double letters, etc.
Some six letter words that end in double letters:accessacrossapogeebamboobefallboo booboohoobungeebypasscaresscoffeecouleecuckoodecreedegreeduressegressembossenrollentreeexcessgoateeharassHawaiilayofflycheemorassmuumuupayoffpeeweepizazzrebuffrecallrecessrefillremissripoffrunoffscrollscruffsetteeshrillsoireesquallstressstrolltarifftattoothrilltoffeetoupeeunlessvoodoo
accentappreciatebannerbattleberrybetterbottlebuttercattlecrabbycuddledessertdribbleefficientetiquetteflabbyflannelfluttergabbyguzzlehammerhappyillinnovationjabberjugglekettleladderlessonmissilemufflenarrowoccuroddpatternpebblepoppypuppypuffyquarrysitterstaffstiffstubbornsummersuppertasseltoffeetunneluselessuttervacuumwafflewiggleyellowzipper
well, the words hajj or hajji would be umpressive on a double or triple word
Words that have double letters, such as "door" or "glass," can pass through a green glass door.
Some non-hyphenated English words with consecutive double letters:# allottee # appellee# assessee# balloon# bookkeeping/bookkeeper # committee # cooee (British colloquial)# heelless# keenness # toolless