GRE

sidereal - relating to the stars :: astral

silt - sediment deposited by running water

simian - monkeylike

simile - comparison of one thing with another, using the word like or as

simper - smirk; smile affectedly

simplistic - oversimplified

simulate - feign :: imitate

sinecure - well-paid position with little responsibility

sinewy - tough; strong and firm

singular - unique; extraordinary; odd :: unusual

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