Mammoth Uncensored Word List:
234 words ending with k, 4 letters long

amok atok back balk bank bark bask bauk beak berk bilk bink birk bisk boak bock bonk book bosk bouk brik buck buik bulk bunk busk calk cark cask cauk cawk chik cock conk cook cork cowk cusk dack dank dark dawk deck deek desk dhak dick dink disk dock doek dook dork douk drek duck dunk dusk faik fank feck fink firk flak folk fork fuck funk gawk geck geek gink gonk gouk gowk guck gunk hack haik hark hask hawk heck hick hock hoik holk honk hook howk hulk hunk husk jack jark jauk jerk jink jock jouk junk kaik kark keek kick kink klik kook kyak lack lank lark lawk leak leek lick link lirk lisk lock look luck lunk lurk lusk mark mask mawk meek milk mink mock monk mook muck murk musk nabk neck nerk neuk nick nook nork oink oulk pack paik park pawk peak peck peek penk perk pick pink pock ponk pook pork pouk puck pulk punk rack raik rank rark reak reck reek reik renk rick rink risk rock rook sack sank seek seik serk sick silk sink soak sock spek spik suck sulk sunk tack talk tank task teak teek tick tink took touk trek tuck turk tusk wack walk wank wark wauk weak week welk wick wink wock work yack yank yark yelk yerk yesk yeuk yirk yock yolk youk yuck zerk zonk