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Time for a spelling lesson:

HUGH is the name of a male, or rarely, a surname.

HUGE is an adjective synonymous with "enormous," or meaning "of exceedingly great scope or nature."

SERIES is a mathematical operator summing a sequence of numbers, which may be finite or infinite but usually follow a pattern. This word may be applied more generally but still means "the sum of a sequence."

SIRIUS ranks second only to the Sun as the brightest star in the sky, located in the constellation Canis Major, 8.6 light-years from earth (that's very close in astronomical terms).

SIRIOUS is an adjective synonymous with "bad," "not joking," "needing attention," "determined," or "extreme."

EXPULSION is a noun meaning "the act of forcing [one] to leave," related to the verb "to expell."

EXPLOSION is a noun synonymous with "burst," "emotion," "increase," or "prove false," related to the verb "to explode."

REPLICATIONS are copies.