This is the 12501st most frequent Russian word.
ковру
"Ковру" is not a standard Russian word; it may be a typo or incorrect form.
The word 'ковра' here refers to the genitive form of the noun 'ковёр' (carpet), used to indicate the object associated with the vase.
Я подарил маме красивую вазу для ковра.
I gave my mom a beautiful vase for the carpet.
The word 'ковра' here is in the genitive case to describe the relationship between an object and the noun 'ковёр'.
На углу ковра лежала маленькая игрушка.
A small toy was lying at the corner of the carpet.
Here, 'ковра' is used in the genitive case to attribute the colors to the carpet.