noun the casual workers might be substitutes for agency workers REPLACEMENT , deputy, relief, proxy, reserve, surrogate, cover, fill-in, stand-in, standby, locum, locum tenens, understudy, stopgap, alternative, ancillary; informal sub; N. Amer. informal pinch-hitter.
adjective a substitute teacher ACTING , replacement, deputy, relief, reserve, surrogate, fill-in, stand-in, temporary, caretaker, alternative, locum, standby, back-up, stopgap, interim, provisional, pro tem, proxy, ancillary; Latin pro tempore; informal second-string; N. Amer. informal pinch-hitting. -opposite(s): PERMANENT.
verb 1low-fat cheese can be substituted for full-fat cheese EXCHANGE , use as a replacement, switch; replace with, use instead of, use as an alternative to, use in place of, use in preference to; N. Amer. trade; informal swap.
2the Senate was empowered to substitute for the President DEPUTIZE , act as deputy, act as a substitute, fill in, sit in, stand in, act as stand-in, cover, act as locum, be a proxy, hold the fort; take the place of, replace, relieve, understudy, take over from, represent, act in someone's stead; informal sub, fill someone's boots/shoes, step into someone's boots/shoes; N. Amer. informal pinch-hit.