Well, darling, the word "bookkeeper" is a fun little gem with two sets of double letters. It's like a little party for the eyes. So, if you're ever in need of a word to impress your friends with your linguistic prowess, there you go.
fettuccinehiccuppingoccurrencesuccessfulsuccessive
balloon coffee
accessoryaddressaggressiveannuallyappallassessassassinbitternessbuccaneerblurrinessbulletproofbutterballbuttresscassettecarelessnesscarryallcoffeecommissarycommissioncrabbinessfurrinesshappinesspennilesspuffinessruddinesssluggishnessstiffnessstillnessstubbornnessstuffinesssuccesstallnessvolleyballwellnesswheelbarrow
· Mississippi · Tennessee
coffeetoffeesettee
fettuccinehiccuppingoccurrencesuccessfulsuccessive
abbreviationaccumulationaccentuationaggressivelyappreciationappropriatedconnotationsdissatisfieddisassociateexpressivelyinstallation
balloon coffee
accessoryaddressaggressiveannuallyappallassessassassinbitternessbuccaneerblurrinessbulletproofbutterballbuttresscassettecarelessnesscarryallcoffeecommissarycommissioncrabbinessfurrinesshappinesspennilesspuffinessruddinesssluggishnessstiffnessstillnessstubbornnessstuffinesssuccesstallnessvolleyballwellnesswheelbarrow
Mississippi and Tennessee
· Mississippi · Tennessee
coffeetoffeesettee
accessaccommodationsbrassinessbeefinessembarrasscoffeechildlessnesscarelessnesscoolnesscheerfullycrisscrossclasslesscommitteecommittedfussinessfootlessfearlessnessfootloosefoolishnesshellishnesshopelessnessheaddresshappinessjoblessnesslawlessnessmoonlessmessinesspuffinessprissinesspeevishnesspennilessraccoonruthlessnesssuccesssleeplesssloppinesssleevelessspookinessstuffinessstiffnessspeechlesssillinessscruffinesstoothlesstattootoffee
airlessnessaimlessnessagelessnessaggressivenessartlessnessassassinassertivenessassessbossinessblissfulnessbrassinessbreathlessnessceaselessnesscrossnesscrassnesscarelessnesschildlessnessclasslessnessexpressivenessfaultlessnessfearlessnessflawlessnessfruitlessnessglassinessglossinessgrossnessguilelessnessgutlessnessheartlessnesshelplessnesslawlessnessjoylessnessmassivenessmindlessnessmessinesspainlessnesspointlessnesspassivenesspossessprogressivenessrepressivenessremorselessnessselflessnesssenselessnessshamelessnesssleeplessnesssoullessnessspinelessnessstressfulnesssubmissivenessthoughtlessnesstimelessnessuselessness
buffcuffmuffpuffballbellbillbullcallcellmallmillmullnullpillpullrollsillselltilltelltallwallwellwillbassbosscussfusshisskisslessmessmissmassmosslosspasssasstossmuttmittbuttdollfallfellfillfull
Mississippi has three sets of doubled letters, two double s pairs, and one double p pair. Tennessee also has three pairs of doubled letters in its name.
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.