Is condensation a base or a root word?

Condensation is neither a base nor a root Word. It is a complete Word in itself. A base Word is a standalone Word that can have prefixes or suffixes added to it to create new Words, while a root Word is the primary lexical unit of a Word, to which prefixes and suffixes can be added. In the case of "condensation," it is a complete Word with its own meaning related to the process of water vapor turning into liquid.