QUICK ANSWER
"¡Hola!" is a form of "¡Hola!", an interjection which is often translated as "Hello!". "Señor" is a form of "señor", a noun which is often translated as "man". Learn more about the difference between "¡Hola!" and "señor" below.
¡Hola!(
oh
-
lah
)An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
1. (salutation)
b. Hi! (colloquial)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
¡Hola! ¿Qué hay de nuevo contigo?Hi! What's new with you?
el señor(
seh
-
nyohr
)A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
1. (adult male)
a. husband
Le dijo a su señor que no se le olvidara la leche para su bebé.She told her husband not to forget the milk for their baby.
b. Mr. (used with a last name)
El señor Ramírez llega mañana de Madrid.Mr. Ramirez arrives tomorrow from Madrid.
An adjective is a word that describes a noun (e.g., the big dog).
5. (colloquial) (splendid)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
a. awesome (colloquial)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
¡Qué señor coche tienes!What an awesome car you have!
c. quite a
Comprobar que todos los cálculos son correctos es un señor trabajo.Making sure all the calculations are correct is quite a job.