These pay 2cents and ask you just to type one word. If you have good vocabulary these should be extremely fast. https://www.mturk.com/mturk/preview?groupId=23NJVKCJ011K8UW3BKBQ4618TB697Q Have fun!
These look quick and easy, but I haven't found any reviews of this requester: https://www.mturk.com/mturk/searchbar?selectedSearchType=hitgroups&requesterId=A2VLAXIAOWWJXS Edit: All gone.