Gorilla and Orang-outang

Gorilla noun - A violent, brutal person who is often a member of an organized gang.

Orang-outang and gorilla are semantically related in ape topic. In some cases you can use "Orang-outang" instead a noun "Gorilla".

Gorilla and orang-outang are semantically related in animal topic. You can use "Gorilla" instead a noun phrase "Orang-outang", if it concerns topics such as ape, primate.