Which of the following words would be the best alternative to 'Dollar'?

Choosing "just say the number" as the best alternative to "dollar" can be understood in specific contexts, particularly when emphasizing simplicity or subjective amounts. In informal settings, where the specific denomination might not be as important as the actual quantity being discussed, this phrase conveys the essence of communicating value without getting bogged down by terminology.

"Dollar" represents a specific measurement of currency in the United States, and in many conversations, using numerals can streamline communication. For example, instead of saying "$5," one might find it more efficient to simply say "five." This is especially true in environments where clarity and speed are prioritized, such as quick exchanges in conversation.

The other options, while they do have merit in certain financial discussions, do not fit as universally as "just say the number." "Cash" typically refers to physical currency or liquidity and can imply the tangible aspect of physical bills rather than the concept of value represented by a specific denomination. "Value" speaks to the worth of an item rather than how it's measured in terms of currency. "Currency," while an accurate general term for monetary systems, does not specifically convey the personal or casual nature of communication as effectively as stating the number does.