Kroon is a term usually associated with the former currency of Estonia and the current currency of Sweden. While there may not be many direct synonyms for the word "kroon," there are related terms that can be used. Examples include "crown," which has a similar spelling and pronunciation and can also refer to a monetary unit in some countries, and "currency," which is a general term that encompasses all forms of money. "Dollar," "euro," and "pound" are also synonyms for kroon if used in the context of currency. Additionally, "coin," "banknote," and "money" are related terms that can be used to describe kroon.