QUICK ANSWER
"Pastos" is a form of "pasto", a noun which is often translated as "pasture". "Césped" is a noun which is often translated as "lawn". Learn more about the difference between "pastos" and "césped" below.
el pasto(
pahs
-
toh
)A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
2. (green area) (Latin America)
Regionalism used in Latin America: all the countries in South America, Central America, and the Caribbean. Does not include Spain.
3. (feed)
a. fodder
Colocamos alambre de púas, porque el ganado del vecino se metía al rancho a comer nuestro pasto.We put up barbed wire because the neighbor's cattle was coming onto our ranch to eat our fodder.
4. (colloquial) (marijuana) (Latin America)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
Regionalism used in Latin America: all the countries in South America, Central America, and the Caribbean. Does not include Spain.
a. pot (colloquial)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
¿Alguna vez has fumado pasto?Have you ever smoked pot?
el césped(
sehs
-
pehd
)A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
1. (gardening)
2. (sports)
a. field (United States)
Regionalism used in the United States
Los New York Yankees estaban en el césped listos para comenzar el partido.The New York Yankees were out on the field ready to start the game.
b. pitch (United Kingdom)
Regionalism used in the United Kingdom
Los futbolistas saltaron al césped.The football players came out onto the pitch.