Some words with a double 'h' are:
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bathhousebeachheadfishhookhitchhikeroughhewnroughhousesleuthhoundsmoothhoundwithheldwithhold
none in the English language
· hobbyhorse · hiccupping · hobbies · hobby · hubby · hiccup · haddock · huddle
Hobby, hubby, hugged, haggle, hottest and hatter are words. They contain a double consonant.
Four letter words using those letters and ending in 'l' are:haulhealteal