Practise the thinking. Keep the judgement.
ねずみ (nezumi): Mouse; rat
ねずみ
nezumi
Meaning
Mouse; rat
Two original examples
台所でねずみを見ました。
I saw a mouse or rat in the kitchen.
この絵のねずみは小さいです。
The mouse in this picture is small.
Usage and distinctions
ねずみ, also written 鼠, can refer broadly to mice or rats. It does not always specify the English distinction. A computer mouse is usually マウス, not ねずみ. Avoid inventing a species distinction that the sentence does not give.