This is the 6599th most frequent Polish word.
denysem
"Denysem" is not a standalone Polish word; it seems to be a form of "Denys" (a name) in a grammatical context, likely the instrumental case.
This usage exemplifies "Denysem" again as instrumental case, necessary after 'z' (with).
Rozmawiałem z Denysem na temat projektu.
I talked with Denys about the project.
This sentence shows "Denysa", the accusative case, for example usage contrast.
Widzę Denysa na horyzoncie.
I see Denys on the horizon.
"Denysem" is the instrumental form of the name "Denys", used here to indicate 'with Denys'.