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"La cafeína" is a form of "cafeína", a noun which is often translated as "caffeine". "Estrés" is a noun which is often translated as "stress". Learn more about the difference between "estrés" and "la cafeína" below.
el estrés(
ehs
-
trehs
)A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
la cafeína(
kah
-
feh
-
ee
-
nah
)A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
