Mongolian

Suffix

-гүй • ‎(-güj)

1. negates participles
2. -less (privative case suffix)

Conjunction

-гүй • ‎(-güj)

1. and (added to the second conjunct, conjuncts are usually terms opposite in meaning.)
2. whether ... or not (with -сан ‎(-san) and -аа ‎(-aa) using the same verb.)