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"R" is a noun which is often translated as "r", and "toro" is a noun which is often translated as "bull". Learn more about the difference between "r" and "toro" below.
la r(
eh
-
rreh
)A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
el toro(
toh
-
roh
)A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).