This is the 8475th most frequent Spanish word.
reina
Queen.
Here, 'reina' is used as a noun meaning 'queen', referring to a female monarch who governs a kingdom.
La reina gobierna con sabiduría.
The queen rules with wisdom.
Here, 'reina' again functions as a verb meaning 'reigns', describing the prominence or superiority of the rose metaphorically in comparison to other flowers.
El jardín está lleno de flores, pero la rosa reina sobre todas.
The garden is full of flowers, but the rose reigns over all.
In this sentence, 'reina' is used as a verb meaning 'reigns', indicating figuratively how the mother exercises leadership or influence within the household.