Mammoth Uncensored Word List:
44 words ending with ll, 10 letters long

basketball butterball buttonball cannonball cheeseball cladophyll cranesbill freeforall greaseball groundsell groundsill hypsophyll lumbermill microphyll multiskill paddleball peppermill preinstall racketball rainsquall rollerball saddlebill sdeignfull sheathbill shieldwall shockstall sicklebill sicklecell silverbill sleazeball snowsquall sporophyll spoylefull standstill storksbill tattersall tchoukball tetherball thumbstall toothshell ultrasmall volleyball windowsill winterkill