Vegetarian.
carnivorous
It can be, in context. If referring to an individual bird, then it is a regular common noun. If it is talking about chicken meat, then this is an uncountable noun, there is no 'a chicken' when talking about chicken meat.
Abstinence or to abstain from eating meat.
vegetarian
Chickens are fowl. However, many people use the word "meat" to refer to any edible flesh.
Not eating meat is abstain/abstaining/abstinence dependng on the number of letters.
A carnivore is a meat-eating animal.
Yes, "chicken" is a noun. It refers to a type of bird commonly raised for its meat and eggs.
The German word for chicken is (das) Huhn or (das) Hühnchen.
I love eating chicken sandwiches!
The term "vegetarian" is a flexible word. Many people who claim to be vegetarians have opposing views on certain subjects. Depending on how rigorous one vegetarian is to another, their opinions on certain foods change. I know several, some eat baked chicken, others refuse to touch any type of chicken. In my experience I have found vegetarian to mean a person who does not eat meat. If you consider baked chicken a meat, then don't eat it. If you consider it not a meat, have at it.
Au jus