Not at all. IE comes with Windows and runs under Windows.
Is door handle synonymous with house?
You can't have a house without doors, and you can't have doors without handles :)
IE is part of windows. Proof? Open windows explorer(not IE), In the Address at the top, type in Http://www.google.com hit enter. Look at that, IE is now in explorer. The core files that run windows are the EXACT same files that make up IE. They are inseperable.