This is the 6470th most frequent Spanish word.
búho
Owl.
Here, "búho" is used as a noun to refer to the animal, specifically an owl.
El búho vive en los bosques oscuros y es muy sabio.
The owl lives in dark forests and is very wise.
In this sentence, "búho" is again a noun, representing a symbolic cultural reference to omens related to the presence of an owl.
Algunos consideran que ver un búho es un presagio de buenas noticias.
Some consider that seeing an owl is an omen of good news.
Here, "búho" is descriptive within the context, referring to the design of the mask resembling an owl.