Aardvark and eel are words. They begin with double letters.
Raccoon is a word. It includes double letters in a row.
coffeetoffeecommittee
Words that have double letters, such as "door" or "glass," can pass through a green glass door.
Llama
addassallillofferrbeeseefeepeeteeweezooboocoogoomootoooddebb
baddestbiggesthottestfattestfittestflattestgladdestglibbestgrimmestmaddestsaddestslimmestsmuggestthinnesttrimmest
accessaccommodationsbrassinessbeefinessembarrasscoffeechildlessnesscarelessnesscoolnesscheerfullycrisscrossclasslesscommitteecommittedfussinessfootlessfearlessnessfootloosefoolishnesshellishnesshopelessnessheaddresshappinessjoblessnesslawlessnessmoonlessmessinesspuffinessprissinesspeevishnesspennilessraccoonruthlessnesssuccesssleeplesssloppinesssleevelessspookinessstuffinessstiffnessspeechlesssillinessscruffinesstoothlesstattootoffee
successfully
fettuccinehiccuppingoccurrencesuccessfulsuccessive
Hawaii
bookkeeper