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"Cerca" is a form of "cerca", an adverb which is often translated as "close". "Valla" is a form of "valla", a noun which is often translated as "fence". Learn more about the difference between "cerca" and "valla" below.
cerca()
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).
A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
2. (enclosure)
a. fence (of wood or wire)
Una casa con una cerca blanca simboliza el sueño americano.A house with a white fence symbolizes the American dream.
b. wall (of stone or brick)
Ningún prisionero podría haber escalado las altas cercas de la cárcel.No prisoner could have scaled the high walls of the prison.
la valla()
A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
1. (enclosure)
a. fence
El jardín tiene mucha privacidad porque tiene una valla alta.The yard is very private because it has a high fence.