das Gebrüll
roar
A very loud, deep, and sustained cry, like that of a large animal (e.g., a lion) or of an angry or shouting person.
Man konnte das Gebrüll des Löwen im ganzen Zoo hören.
You could hear the lion's roar throughout the whole zoo.

roar
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roar
A very loud, deep, and sustained cry, like that of a large animal (e.g., a lion) or of an angry or shouting person.
Man konnte das Gebrüll des Löwen im ganzen Zoo hören.
You could hear the lion's roar throughout the whole zoo.

The word is derived from the verb 'brüllen' (to roar/shout). The prefix 'Ge-' forms a noun here that sums up the action or sound of roaring. Such nouns are often neuter (das).
Das laute Brüllen wurde zu einem ununterbrochenen Gebrüll.
The loud roaring turned into an uninterrupted roar.
'Gebrüll' (roar/roaring) is a noun that is almost always used in the singular because it describes a continuous, uncountable noise. You do not say 'zwei Gebrüllen' (two roars).
Das Gebrüll der Fans im Stadion war ohrenbetäubend.
The roar of the fans in the stadium was deafening.
'Gebrüll' (roar/roaring) is often used to describe the loud calls of large animals, such as 'das Gebrüll eines Löwen' (the roar of a lion) or 'eines Bären' (of a bear). But it can also refer to loud, angry, or enthusiastic shouting by people.
Plötzlich hörten wir wütendes Gebrüll aus dem Nebenzimmer.
Suddenly we heard angry roaring from the next room.
scream
'der Schrei' and 'das Gebrüll' both describe very loud sounds. 'Schrei' is more general and can be short. It fits people in many emotional states, for example fear, pain, or joy. 'Gebrüll' sounds stronger, deeper, and often longer. It is used for large animals or for people who are shouting very loudly and angrily. The words can be confused because both are loud. But if you mean only a short, single sound, 'Schrei' fits better. For continuous, intense noise, 'Gebrüll' sounds more natural.

Im Zoo hörten die Kinder das Gebrüll der Löwen schon von weitem.
At the zoo, the children could hear the lions' roar from far away.
Ein kurzer Schrei aus dem Garten erschreckte die Familie.
A short scream from the garden startled the family.