This is the 99th most frequent Turkish word.
söz
"Word," "promise," or "speech."
In this context, 'söz' refers to 'words' or 'statements' that someone says.
Onun sözleri gerçekten etkileyici.
His words are truly impressive.
Here, 'söz' is used to mean 'promise' or 'word' given as a commitment.
Söz verdim ve onu tutacağım.
I made a promise and I will keep it.
Here, 'söz' is used metaphorically to indicate 'talk' or 'claims' as opposed to actions.