Marketable security refers to any investment that can be easily bought and sold in the market. There are several synonyms for marketable security, including tradable security, liquid security, and negotiable security. A tradable security is an investment that can be exchanged for money in the market, while a liquid security can be easily converted into cash. A negotiable security is an investment that can be transferred or sold to another party without any difficulty. Other synonyms for marketable security include readily marketable security, public security, and exchangeable security. Regardless of the synonym used, all refer to investments that can be easily traded in the market without any significant barriers to entry or exit.