CPF, or Central Provident Fund, is a social security savings plan in Singapore. There are a variety of synonyms for CPF depending on the context. For instance, in relation to retirement, CPF can be referred to as a pension or retirement fund. When considering investments, CPF can be swapped with annuity or long-term savings plan. In Singapore, CPF is also referred to as the "social security system" or the "national savings plan". Alternatively, the term "provident fund" could be used to describe a similar savings plan in other countries. Overall, there are many different synonyms for CPF depending on the industry and region where it is being discussed.