
If you have questions about the conjugation of ревун or Russian nouns in general, you can practice and get feedback from a professional tutor.
Кончай кидаться дерьмом, как обезьяна-ревун, а?
Quit hurling feces like a howler monkey, would you?
Он превзошёл тебя, ты меня, а я - обезьяну-ревуна.
He is to you as you are to me as I am to a howler monkey.