Idea 1: "Fire" or "Hire" the duck, with job-related responses
Idea 2: "Launch" the duck, with a spaceship related response
Idea 3: "Record" the duck, with a response about recording the duck swimming in the water.
Idea 4: "Draw" the duck, where you draw the duck with a paper and pencil. The duck ruins the paper by getting it wet.
Idea 5: "Trick" the duck, where you do a bad magic trick. It doesn't work.
Idea 6: "Run" the duck, changing the duck sprite to a pixellated one with a joke about old computers (maybe?)
Idea 7: "Meme" the duck. A line about posting a meme about the duck to Reddit (or a name similar to it but duck related)
Idea 8: "Zap" the duck, with a line about a laser gun.
That's all the ideas I can think of, hopefully it helps you with adding more words!