This is the 2952nd most frequent Arabic word.
وقتل
"وقتل" means "and he/she/it killed."
Here, 'وقتل' is a verb in the past tense indicating the act of killing performed by the lion upon the gazelle.
وقتل الأسد الغزال في الغابة.
The lion killed the gazelle in the forest.
In this sentence, 'قتل' is part of a descriptive clause detailing the incident.
شهد الناس الحادثة التي قتل فيها الأسد غزالًا.
People witnessed the incident in which the lion killed a gazelle.
Here, 'قتل' acts as a verbal noun indicating the general action of killing.