Many more words with doubled consonants can be created by adding vowel suffixes to shorter words e.g. hop-hopping, spin-spinner. This is just a sample.
After a | After e | After i | After o | After u as in punnet | After u as in pudding |
abbess abbot addict address affect affix aggress allot ally amass annex annoy annul append apply assent assess asset assist assume atoll attach attack attempt attend attract ballot barrack basset batten cannon cannot carrot carry channel chattel daffy dally dazzle fatten flatten flattest gallant gallon gallop gannet gladden goddess haddock haggis hammock happen jazzy madden maggot mammal mammoth mapping mattress parrot rabbit rappel rattan sadden savvy snazzy | abbess address assess begging belly berry better blessing caress cherry confess depress dressy dwelling ebbing effect eggplant eggshell express fennel ferret ferry hello impress jelly jetty kennel kettle leggings lemming lessen lesson letters lettuce merry messy nettle pebbles pellet pennant penny pepper petty process profess redden reddest reddish rennet settee settle shredded sledding spelling stemming teller telly tennis undress vessel vetting webbing wedding wettest witness yelling | amiss biggest billet billy bitten brimming chilly chirrup cirrus dimmest divvy dizzy drizzly fibbing fillet filly fizzle fizzy flippant frilly frizzy gibbon gimmick griffin grimmest grizzly hidden hippest hissing iffy immune innate innings jiffy kipper kissing kitten mastiff midden mitten pippin quipping quizzes ribbon ripping ripple shipping silly sitter sizzle skittish skivvy slimmest slipper smitten sniffy snippet spiffy stirrup swizzle tariff tizzy unpinned unzipped whippet zippy | across blossom boffin bonnet bossy bottom brolly coffin collect command commend comment commit common commune commute connect connive connote copping correct corrode cotton cutoff dismiss dissent dobbin dollop dolly emboss folly fossil glossy goddess golly gossip gotten grommets hobbit Holland holly hottest nozzle oddments oddness offal offend offset oppose oppress pommel popper poppet possum prodded ripoff rotten shopping snobbish sobbing sodden sonnet sorry tipoff torrent trodden | bubble butter buttocks button buttress cubby cuddle currant current curry fluffy flummox flurry flutter funnel fussy fuzzy glummest glutton grubby gullet gully gutted hubby juggle muddy muffin mutton nugget plummet puddles puffin puffy pummel punnet puppet rubber rubbish rubble rudder rugged runoff scrubbing scurry shudder sluggish smuggle sputter stubble stubborn stuffy sudden suffix summit summon supper supplant supply suppose suppress thudded tuffet tunnel turret upping utter | bullet bullock bully fully hummus pudding pullet pulling |