This is the 2308th most frequent Japanese word.
うさぎ
Rabbit.
Here, 'うさぎ' refers to a specific animal, the rabbit, as the subject of the sentence.
うさぎは草を食べています。
The rabbit is eating grass.
In this sentence, 'うさぎ' is the direct object, denoting a rabbit that was seen in the park.
公園でうさぎを見ました。
I saw a rabbit in the park.
In this example, 'うさぎ' refers to the rabbit in a general sense, describing a characteristic of rabbits as a species.