This is the 7698th most frequent Spanish word.
lerma
"Lerma" is a proper noun referring to several geographical locations in Spain and Mexico; it may also be a surname.
Here, 'Lerma' is used as a proper noun, referring to a place name, likely a town or city.
Tuve que viajar a Lerma este fin de semana.
I had to travel to Lerma this weekend.
In this case, 'lerma' is used as a term for 'layer' or 'covering', illustrating its usage as a common noun.
La lerma cubre el suelo del bosque en esta época del año.
The layer of fallen leaves covers the forest floor during this time of the year.
Here, 'Lerma' is used to name a specific type of bread, showing its application as a proper noun for naming objects.