vs
QUICK ANSWER
"Bienvenida" is a noun which is often translated as "welcome", and "bienvenidos" is an adjective which is also often translated as "welcome". Learn more about the difference between "bienvenida" and "bienvenidos" below.
la bienvenida()
A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
1. (reception)
a. welcome
Los campeones recibieron una calurosa bienvenida en su ciudad.The champions received a warm welcome in their city.
bienvenido()
An adjective is a word that describes a noun (e.g., the big dog).
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).