What is a Southpaw Word™?

_{This is in the spirit of the What is a Word/Phrase™ series started by [JLee][2] with a special brand of [Phrase™][3] and [Word™][4] puzzles.}

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If a word conforms to a special rule, I call it a Southpaw Word™.

Use the following examples below to find the rule.

And, if you want to analyze, here is a CSV version:

SOUTHPAW WORD™, NOT SOUTHPAW WORD™
FAST, QUICK
SCREW, NAIL
EVADERS, DEFLATERS
SWEET, SOUR
TREATS, TRICKS
AVERTED, WELCOMED
REAR, FRONT
CREED, MANTRA
@45266, COMMUNITY