This is the 1732nd most frequent Spanish word.
derecho
"Right" (as in legal entitlement) or "straight."
Here, 'derecho' means 'right', referring to a legal or moral entitlement.
Tienes el derecho de expresar tu opinión.
You have the right to express your opinion.
In this sentence, 'derecha' (related form of 'derecho') refers to the right-hand side.
Inclinó la silla hacia la derecha.
She tilted the chair to the right.
Here, 'derecho' means 'straight', referring to alignment without curves or bends.