Hypothecated is a word that many people may not be familiar with. It is a legal and financial term that refers to the act of pledging an asset as collateral for a loan. There are several synonyms for this word that can be used interchangeably. These include mortgaged, pledged, collateralized, secured, and guaranteed. Each of these words has a similar meaning, in that they all refer to the act of using an asset as security for a debt. So, whether you are talking about a mortgage, a loan, or any other financial transaction, you can use any of these synonyms to describe the process of hypothecating an asset.