That's odd.
baldnessbaseballbaselessbluenessboldnesscalmnesscarelesscarefreecluelesscoldnessdistressduckbilldumbnessdampnessdeafnessevennessfairnessfondnessfortressgladnessgoddesshardnesshairlesshomelesskindnesslistlesslifelesslovelesslatenessmattressmeannessmindlessneedlessoverpassopennesspainlessplaybillprogressrainfallrecklessrudenessruthlesssamenessseedlessselflesssicknesssnowballsnowfalltimelessuglinessvastnesswindfall
Some six letter words that end in double letters:accessacrossapogeebamboobefallboo booboohoobungeebypasscaresscoffeecouleecuckoodecreedegreeduressegressembossenrollentreeexcessgoateeharassHawaiilayofflycheemorassmuumuupayoffpeeweepizazzrebuffrecallrecessrefillremissripoffrunoffscrollscruffsetteeshrillsoireesquallstressstrolltarifftattoothrilltoffeetoupeeunlessvoodoo
Pass, moss, toss, loss, mess, thee.
Coffee is a word. It contains double e and double f. Address contains two double letters.
That's odd.
baldnessbaseballbaselessbluenessboldnesscalmnesscarelesscarefreecluelesscoldnessdistressduckbilldumbnessdampnessdeafnessevennessfairnessfondnessfortressgladnessgoddesshardnesshairlesshomelesskindnesslistlesslifelesslovelesslatenessmattressmeannessmindlessneedlessoverpassopennesspainlessplaybillprogressrainfallrecklessrudenessruthlesssamenessseedlessselflesssicknesssnowballsnowfalltimelessuglinessvastnesswindfall
Some six letter words that end in double letters:accessacrossapogeebamboobefallboo booboohoobungeebypasscaresscoffeecouleecuckoodecreedegreeduressegressembossenrollentreeexcessgoateeharassHawaiilayofflycheemorassmuumuupayoffpeeweepizazzrebuffrecallrecessrefillremissripoffrunoffscrollscruffsetteeshrillsoireesquallstressstrolltarifftattoothrilltoffeetoupeeunlessvoodoo
Pass, moss, toss, loss, mess, thee.
Coffee is a word. It contains double e and double f. Address contains two double letters.
The letters spell the word double.
Raccoon is a word. It includes double letters in a row.
3. Actually, it is the only English word with 3 sets of double letters in a row.
The English word BOOKKEEPING or BOOKKEEPER has three sets of consecutive double letters. SUBBOOKKEEPER is the only word with four sets of consecutive double letters, although these words should be hyphenated.
double
bookkeeper
Bookkeeper. Although Subbookkeeper has four.