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QUICK ANSWER
"Creo" is a form of "creo", a phrase which is often translated as "I believe". "Pienso" is a form of "pienso", a noun which is often translated as "fodder". Learn more about the difference between "creo" and "pienso" below.
creo
A phrase is a group of words commonly used together (e.g., once upon a time).
a. I believe
Creo que todos tienen que ayudar a cuidar el planeta.I believe everybody has to help save our planet.
2. (I suppose)
a. I think
¿Cuál es el apartamento de Alicia? - Creo que vive en el cuarto piso.What's Alicia's apartment? - I think she lives on the fourth floor.
el pienso(
pyehn
-
soh
)A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
a. fodder
El veterinario me recomendó dar de comer a los animales otro tipo de pienso.The vet recommended that I should give the animals a different kind of fodder.
b. feed
Los cerdos ibéricos de primera comen bellotas y hierba en vez de pienso.First-class Iberian pigs eat acorns and grass instead of feed.
a. dry kibble (United States)
Regionalism used in the United States
Toby debe comer pienso especial porque lo esterilizamos hace poco.Toby needs to eat special dry kibble because we had him neutered recently.
b. dry dog food (for dogs) (United Kingdom)
Regionalism used in the United Kingdom
Vendemos todas las mejores marcas de pienso para sus mascotas.We stock all the top brands of dry dog food for your pets.
c. dry cat food (for cats) (United Kingdom)
Regionalism used in the United Kingdom
Solo le doy pienso y agua a mi gatito.I just give my kitten dry cat food and water.