das Aas
carrion
The decomposing body of a dead animal, often serving as food for other animals.
Die Geier kreisten über dem Aas in der Savanne.
The vultures circled above the carrion in the savanna.

carrion
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carrion
The decomposing body of a dead animal, often serving as food for other animals.
Die Geier kreisten über dem Aas in der Savanne.
The vultures circled above the carrion in the savanna.

You can easily recognize the meaning from the context. If people are talking about animals, nature, or decomposition, it means the animal carcass. In an argument or insult between people, it is an insult.
Der Geruch von Aas lag in der Luft.
The smell of carrion was in the air.
Other words are derived from 'Aas' (carrion), such as the adjective 'aasig' (mean, disgusting) or the compound 'der Aasgeier' (a vulture that eats carrion). These words help you understand the negative connotation.
Sein Verhalten war wirklich aasig.
His behavior was really nasty.
In the biological sense, 'Aas' (carrion) is often connected with animals that feed on it. Typical 'Aasfresser' (scavengers) are vultures, hyenas, or ravens.
Einige Insektenarten sind darauf spezialisiert, Aas zu zersetzen.
Some insect species are specialized in decomposing carrion.
As an insult, 'Aas' (bastard/scumbag) is extremely strong, vulgar, and hurtful. It is used only in situations of great anger or contempt and should be handled with extreme caution.
Er nannte seinen Rivalen ein hinterhältiges Aas.
He called his rival an underhanded scumbag.
corpse
'die Leiche' and 'das Aas' both have to do with a dead body. The important difference is: 'Leiche' is used for the dead body of a human being. 'Aas' usually means the decomposing body of a dead animal, often in nature as food for other animals. The words can be confused because both refer to something dead. For humans, however, you do not neutrally say 'Aas', but 'Leiche'. When used for people, 'Aas' sounds very crude and insulting and is not part of a factual description.

Am Waldrand fraßen Krähen an dem Aas eines Rehs.
At the edge of the forest, crows were feeding on the carrion of a deer.
Die Polizei fand die Leiche in einem verlassenen Haus.
The police found the corpse in an abandoned house.