Synonyms for Early:

adj.

earliest (adjective)
primordial, original.
early (adjective)
soon, precipitous, untimely, half-baked.
inappropriate (adjective)
untimely.
preceding (adjective)
avant-garde, foregoing, introductory, earlier, preceding, anteceding.
rudimentary (adjective)
embryonic.
sooner than expected (adjective)
briefly, in advance, shortly, beforehand, quick, pronto, with time to spare, presently, soon.

adv.

immediately (adverb)
first.
sooner than expected (adverb)
anticipatory, untimely, precipitant, unexpected, advanced, immature, speedy, immediate, direct, precocious.

n.

before, by the time, northern, Since, barely, dwarf, spring, hardy, bush, prior. aromatic, barren, algal, bare, bushy, start, androgynous, aquatic, creeping, arboreal, biennial. all along, at first, from the get-go, antediluvian, front end, opening. imminent, in the short run/term, around the corner, in no time (at all), close, soon, at the earliest/first opportunity, time, just, any day/moment etc. now. historically, those were the days, with time to spare, the annals of something, historical, retrospective, rewrite history, date back to, in advance, in retrospect. early (noun)
beforehand, first, in advance, initial, ancient, primitive, untimely, precocious, advanced, primordial, with time to spare, opening, primeval.

Other synonyms:

barely, boyhood, childhood, childlike, all along, girlhood, Since, developmental, adolescence, pioneer, date back to, development, front end. babyish, before, opening, ancient, historically, childish, retrospective, beforehand, prior. historical, antediluvian. ahead.

Usage examples for early

  1. It was early fall now. – A Fool There Was by Porter Emerson Browne
  2. I shall leave early to- morrow, and may not see you alone. – The Complete Project Gutenberg Works of George Meredith by George Meredith
  3. What could have made him clear out so early – 'Twixt Land & Sea by Joseph Conrad