This is the 1143rd most frequent Russian word.
опек
The word "опек" does not exist in standard Russian; it may be a typo or error. Did you mean "опека" (guardianship, care, or custody)?
Опека indicates 'guardianship' in a social or legal context.
Опека государства над детьми-сиротами очень важна.
State guardianship over orphans is very important.
Here, опека means 'guardianship' in a familial or personal context.
Она приняла на себя опеку своего младшего брата после смерти родителей.
She took guardianship of her younger brother after their parents' death.
Опека refers to 'mentoring or guidance' in a professional context.