wild
long-tailed, mallard, etc.
plastic, rubber
A rubber duck floated in the bath.

roast, roasted (esp. AmE)

flock
A flock of ducks bobbed near the shore.

feed
Every afternoon they went to the park to feed the ducks.

hunt

quack
paddle, swim
The ducks paddled furiously to grab the bread.

bob
dive
dabble
waddle
A family of ducks waddled along the river bank.

nest
fly
migrate

breast
Slice the duck breast and serve.

confit
egg
fat
In a large saucepan, melt the duck fat.

pond
blind (= a small shelter from where you can watch ducks)
hunter, hunting (both AmE)
season (= the time when ducks are hunted)

Duck is used with these nouns as the object:
head, responsibility