This is the 16624th most frequent Russian word.
семейства
"Семейства" in English means "families" or "groups," often used in the context of biological classification or social units.
In this sentence, 'семейства' is used in its nominative singular form as part of the phrase 'семейства кошачьих' to refer to a biological grouping.
Этот вид животных принадлежит к семейству кошачьих.
This species of animals belongs to the feline family.
Here, 'семейства' is used in its plural form to refer to human families, indicating a group or clan structure.
В нашем районе много семей, представляющих разные семейства.
In our neighborhood, there are many families representing different clans.
In this context, 'семейств' (the genitive plural form, derived from 'семейства') refers to biological families in a scientific context.