S: (v) exchange, change, interchange (give to, and receive from, one another) "Would you change places with me?"; "We have been exchanging letters for a year"
W: (adj) cashable [Related to: cash] (able to be converted into ready money or the equivalent) "a cashable check"; "cashable gambling chips"; "redeemable stocks and bonds"; "a redeemable coupon"
W: (n) cash [Related to: cash] (money in the form of bills or coins) "there is a desperate shortage of hard cash"