This is the 1355th most frequent Polish word.
powodów
"Reasons."
Here, 'powodów' is the plural form of 'powód', meaning 'reason', in the genitive case used after 'wiele' (many).
Mam wiele powodów, aby uczyć się tego języka.
I have many reasons to learn this language.
The word 'powodów' again appears in the genitive plural, used with 'z różnych' to indicate 'for various reasons'.
Z różnych powodów nie mogłem przyjść na spotkanie.
For various reasons, I couldn't attend the meeting.
In this case, 'powodów' denotes reasons in the context of 'brak' (absence), requiring 'powodów' in the genitive plural.