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"Yo" is a pronoun which is often translated as "I", and "piscina" is a noun which is often translated as "swimming pool". Learn more about the difference between "yo" and "piscina" below.
yo()
A pronoun is a word that stands in for a noun (e.g., she).
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
3. (psychology)
la piscina()
A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).