changer

"Merchants sometimes discount five or six per cent for prompt payment of bills."

"Wampum was used as a currency by Amerindians."

"My friend told me there was something in the box, but I didn't know what it was yet. "

"Do you need a gift for that special someone?"

"Sentence: "In signal processing, Fourier transforms are essential tools for analyzing the frequency components of audio files." "

"We were warmed by the bright sunshine."

"She offered to help with her homework."

"The product is undergoing a change in order to improve it."

"Yesterday our local garage employed a new mechanic."

"The tadpole changed into a frog.   Stock prices are constantly changing."

"The commuters bustled about inside the train station."

"All in all, it was an even exchange."