In Greek:
The Greek word for hello is "γεια" (pronounced as "ya"). It is pronounced with a soft "g" sound and a long "i" sound. The stress is placed on the first syllable.
In Turkish:
The Turkish word for hello is "merhaba" (pronounced as "merr-ha-bah"). It is pronounced with a rolling "r" sound and a hard "b" sound. The stress is placed on the second syllable.