vs 

QUICK ANSWER
"Ellos" is a form of "ellos", a pronoun which is often translated as "they". "A qué hora" is a form of "a qué hora", a phrase which is often translated as "at what time". Learn more about the difference between "ellos" and "a qué hora" below.
ellos(
eh
-
yohs
)
A pronoun is a word that stands in for a noun (e.g., she).
pronoun
a. they (subject)
¿Ellos van a venir a cenar?Are they coming to dinner?
b. them (after prepositions)
Si confías en ellos, dales las llaves.If you trust them, give them the keys.
c. them (in comparisons)
Mi hermano y yo somos tan altos como ellos.My brother and I are as tall as them.
d. theirs (after "de" to show possession)
Esta ropa es de ellos.These clothes are theirs.
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a qué hora(
ah
 
keh
 
oh
-
rah
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. at what time
¿A qué hora quedaste con Charlie? - A las 8 pm.At what time did you arrange to meet Charlie? - 8 pm.
b. what time
No sé a qué hora sale el último bus.I don't know what time the last bus leaves.
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