earlier
adverb(ear-li-er)
comparatives of `soon' or `early'
Examples:
Came earlier than I expected. 
earlier
adjective(ear-li-er)
(comparative and superlative of `early') more early than; most early
Examples:
A fashion popular in earlier times. 
His earlier work reflects the influence of his teacher. 
earlier
adverb(ear-li-er)
earlier in time; previously
Examples:
He called me the day before but your call had come even earlier. 
Her parents had died four years earlier. 
I mentioned that problem earlier. 
earlier
adverb(ear-li-er)
before now
Synonyms: in the beginning, in the first place, 
originally, to begin with,