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prostitute is an individual who trades sexual favors for some form of compensation. It can also be used to describe any person who "sells" something of value, often going against values, morals, or ethics. For example, "Nikita prostituted his moral convictions to rise within the company ranks to senior manager."
"Bitch" is the term for a female dog, and is a noun. It is often misused for a variety of purposes, usually vulgar, against female humans or a feminine-acting male. To be someone's "bitch" indicates sexual servitude or to express the opinion that the other person has little value or worth. The term "bitch" as a noun or "bitching" is also used to describe someone who others think of as rigid, unyielding, mean, nasty, etc.