This is the 4369th most frequent Arabic word.
نمر
Tiger.
The word "نمر" refers here to the noun meaning 'tiger'.
رأيت نمرًا في الحديقة.
I saw a tiger in the garden.
Here, "نمر" is used as a subject in the sentence, still referring to 'tiger'.
النمر يتحرك بسرعة كبيرة.
The tiger moves very quickly.
In this sentence, "نمر" is used idiomatically as a verb meaning 'to pass through' or 'to go over'.