28 substitute synonyms include replacement, deputy, relief, proxy, reserve, surrogate, cover, fill-in, stand-in, and standby. Substitute is a noun, and its antonyms are original and permanent. Here are some additional synonyms for "substitute" with example sentences.
28 other ways to say substitute.
He found a substitute for milk.
She works as a substitute teacher.
They’ll substitute another ingredient instead.
You can substitute honey for sugar.