Ok muskan, as this has been playing on my mind a bit, so I am going to break what you are saying down into basic english definitions:

Whore - Someone who has sex for money
Promiscuous - Someone who does not discriminate or has many sexual partners

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By definition a whore is promiscuous 99.99999% of the times, unless they are bound to one very rich client.

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Submissive - Someone who is inclined or willing to submit to orders or wishes of others or showing such inclination.

Slave - a person who is owned by someone

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This is the difference between a whore and a slave to answer your initial question. Even in the very rare case where a whore is tied to one client, this would not be in an ownership sense, mearly a mutually beneficial financial arrangement.

Extrapolating your logic I could pose the question, "What is the difference between a slave and a cat?" On the logic that sometimes I call my slave kitten? I really hope this clears things up for you, and why it may be offensive to people.

You said you were not looking for dinfitions, simply the emotional differences, you are essentially asking how a car feels about being not an apple.

Regards,

Arch

ps in my previous post "Being called a whore while trying to humilate a sub/slave does not make her a sub" was meant to read "Being called a whore while trying to humilate a sub/slave does not make her a whore"