The word "frost" is often used to describe the thin layer of ice crystals that form on surfaces when temperatures drop below freezing point. However, there are several other words that can be used as synonyms for "frost" depending on the context of use. For instance, "hoarfrost" is often used to describe the frost that forms on trees, bushes, and other vegetation. "Rime" is another word that can be used to describe frost in a more technical sense, typically referring to the frost that forms on the blades of aircraft and other machinery. Other synonyms for "frost" include "freeze," "ice," "crust," "glaze," and "snow".