As far as I can tell, the tags are being used interchangeably.
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closed as off-topic by mmyers, CRABOLO, Robert Cartaino♦ Aug 13 '14 at 16:46
This question appears to be off-topic. The users who voted to close gave this specific reason:
Went ahead and did a retag in some downtime, so thread-safe should disappear soon. If anyone has the rep to get the synonym in place they are quite welcome to do so.