How to Say "proprietors" in Spanish
The Spanish word for “proprietors” is “dueños” — A2 level. This is a very common word in everyday Spanish.

Examples
Los dueños de la panadería abren a las seis de la mañana.
The owners of the bakery open at six in the morning.
Ellos son los dueños de la casa que queremos alquilar.
They are the owners of the house we want to rent.
Debemos ser dueños de nuestras propias decisiones.
We must be masters of our own decisions. (Figurative)
Masculine Plural Form
Dueños is the plural form of dueño (owner). It is used when referring to a group of male owners, or a mixed group of male and female owners.
Ownership and 'Ser'
To state who owns something, you usually use the verb 'ser' (to be) followed by 'dueño/a/os/as de...' (e.g., 'Somos los dueños de la tienda').
Using 'Dueños' for all-female groups
Mistake: “Las dueños de la empresa son muy amables.”
Correction: Las dueñas de la empresa son muy amables. (Use 'dueñas' when the group is exclusively female.)
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