Earliest
Part of speech: adjective
Definition: Superlative of early.
Part of speech: adverb
Definition: Superlative of early.
Example sentence: A desire to be observed, considered, esteemed, praised, beloved, and admired by his fellows is one of the earliest as well as the keenest dispositions discovered in the heart of man.
Earlier
Part of speech: adverb
Definition: At a time before expected; sooner than usual.previously; before now; sooner
Part of speech: adjective
Definition: At a time in advance of the usual or expected event.occurring previously
Example sentence: I watched the Indy 500, and I was thinking that if they left earlier they wouldn't have to go so fast.