Some words associated with 'start' are: button false head jump key line stop time with up
whitewall whitewash whitecap whitehead whiteout whitening whitetail whiteboard whitewaterwhitebaitwhitewine
sub, submarinesubtract sublime subject submerge submissive subliminal sublet substitute subconscious submit submission subside sublimation substantial
shotgunshot clockshot glass
The only word you can make with UP is up. However there are many words that include UP in them: abrupt acupuncture backup bankrupt blowup breakup buildup buttercup cantaloupe catsup checkup closeup...