This is the 868th most frequent Japanese word.
あひる
Duck (domestic duck).
Here, "あひる" refers to the noun 'duck,' describing interaction with it.
彼女はあひるとたくさん遊んでいました。
She was playing a lot with the ducks.
Here, "あひる" is used as a noun referring to the animal 'duck.'
その池には白いあひるがいます。
There are white ducks in that pond.
In this sentence, "あひる" is part of the phrase "あひるのように" (like a duck), which describes an action.