Substitute
Relief
Synonyms Replacement, relief, reserve, cover, stand-in, locum, understudy, alternative, sub, deputy, proxy, surrogate, fill-in, standby, locum tenens, stopgap, ancillary, and pinch-hitter.
Exchange
Synonyms Exchange, switch, use instead of, use in place of, trade, use as a replacement, replace with, use as an alternative to, use in preference to, and swap.
Example Sentences
You can substitute honey for sugar.
He found a substitute for milk.
She works as a substitute teacher.
They’ll substitute another ingredient instead.