Noun

• S: (n) surrogate, alternate, replacement (someone who takes the place of another person)

Verb

• S: (v) alternate, jump (go back and forth; swing back and forth between two states or conditions)
• S: (v) alternate (exchange people temporarily to fulfill certain jobs and functions)
• S: (v) understudy, alternate (be an understudy or alternate for a role)
• S: (v) interchange, tack, switch, alternate, flip, flip-flop (reverse (a direction, attitude, or course of action))
• S: (v) alternate, take turns (do something in turns) "We take turns on the night shift"

Adjective

• S: (adj) alternate (every second one of a series) "the cleaning lady comes on alternate Wednesdays"; "jam every other day"- the White Queen
• S: (adj) alternate, alternative, substitute (serving or used in place of another) "an alternative plan"
• S: (adj) alternate, alternating (occurring by turns; first one and then the other) "alternating feelings of love and hate"
• similar to
• antonym
• S: (adj) alternate (of leaves and branches etc; first on one side and then on the other in two ranks along an axis; not paired) "stems with alternate leaves"