substitute

1 to give up (something) and take something else in return <can I substitute coleslaw for potato salad if I order the chicken plate?> Synonyms commute, exchange, shift, change, swap, switch, tradeRelated Words interchange; displace, replace, supersede; cede, hand over, surrender, yield; reciprocate

2 to serve as a replacement usually for a time only <substituting for the talk show host while she is on vacation> Synonyms fill in, pinch-hit, stand in, step in, sub, cover, take overRelated Words understudy; relieve, spell; double (as)

3 to take the place of <“John Doe,” “Jane Doe,” and “Baby Doe” substituted the real names of the parties involved to preserve their privacy> Synonyms cut out, displace, displant, relieve, replace, supersede, supplantRelated Words preempt, usurp

a person or thing that takes the place of another <you'll be getting a substitute until your regular teacher is feeling better> <if you like, you can use nuts as a substitute for coconut in that recipe> Synonyms backup, cover, designated hitter, fill-in, locum tenens, pinch hitter, relief, replacement, reserve, stand-in, sub Related Words alternate, understudy; apology, makeshift, stopgap; agent, assignee, attorney, commissary, delegate, deputy, envoy, factor, procurator, proxy, rep, representative, surrogate; assistant, reliever, second; successor, superseder