This is the 4373rd most frequent Russian word.
бывают
"(They) happen," "(they) occur," or "(they) are" (depending on context).
The word 'бывают' is used to express the idea of something occurring or being the case occasionally or at times.
Дети иногда бывают непослушными.
Children are sometimes disobedient.
Here, 'бывают' indicates the existence or occurrence of certain events or phenomena in nature.
В природе бывают редкие явления.
Rare phenomena occur in nature.
The usage of 'бывают' conveys the presence or possibility of exceptions.