Tsp is an abbreviation of teaspoon and usually refers to a unit of volume measurement in cooking recipes. However, there are several synonyms that can be used as a replacement for tsp. Some of the synonyms for tsp are ts, t, tea spoon, and teaspoonful. In case required, these words can be used interchangeably instead of tsp to specify the amount of an ingredient that needs to be added. While measuring, one must be careful about the level of accuracy and the unit of measurement, whether it is a teaspoon or a tablespoon. So, depending on personal preference, one can select the synonym that suits them best.