Dodo, judo, redo and undo are 4 letter words. They end with the letters do.
Stall.
One option is the word conga.
Delay.
tattoo
congo
* jumbo * giant * hefty * large
empty
igloo
armoramberbikerboxercatercolorcoverdinerdiverelderfavorflourgiverhikerhumorinnerjokerlaborlemurlaserloserliterleverloverlivermajormakermayormanormotorminormoverneverownerolderpokerpowerrazorriverrumorsaversavorseversobertatertowertakertruertumorwaterwiper
Three (3).
utau. oo-TAH-oo
shampoo