This is the 3460th most frequent Spanish word.
espejo
Mirror.
In this sentence, 'espejo' is used as a noun referring to a physical object that reflects images.
El espejo en la pared está sucio.
The mirror on the wall is dirty.
Here, 'espejo' metaphorically represents something that reflects or embodies beauty.
La pintura de ese lago actúa como un espejo de la belleza natural.
The painting of that lake acts as a mirror of natural beauty.
In this context, 'espejo' is used as a common noun indicating an everyday usable object.