so

so - noun

the syllable naming the fifth (dominant) note of any musical scale in solmization

so - adverb

to a very great extent or degree
in a manner that facilitates
in such a condition or manner, especially as expressed or implied
to a certain unspecified extent or degree
in the same way; also
in the way indicated
(usually followed by `that') to an extent or degree as expressed
subsequently or soon afterward (often used as sentence connectors)
(used to introduce a logical conclusion) from that fact or reason or as a result
in truth (often tends to intensify)

so - thesaurus

Scrabble score = 2