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There is only one four-letter word beginning with SIA

SIALsial n. (Geology) The rocks rich in silicon and aluminum that form the upper layer of the earth’s crust, which…
SiAl n. (Geology) Alternative form of sial.
SIAL n. the upper layer of the continental crust, so called because it is rich in silica and aluminum oxide.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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