Synonyms for Before:

adv.

all (adverb)
earlier.
earlier (adverb)
previous, Since, back, Aforetime, in front, past, previously, heretofore, formerly, ahead.

n.

about, by, beyond, apart, after, around, across, along. advance, by the time, prior, first, barely, previous, advanced, early. at one time, precede, already, formerly, Aforetime, past, previously, once, erstwhile, one day, Beforetime. when the time comes, in the long run/term, heretofore, to come, sooner or later, tomorrow, yet, someday, later, far-off. here, all, then, Until, This, sometime, Whenever, when, last. look before you leap, you can't be too careful, look out, watch it, if I were you, it's a good idea to do something, too many cooks (spoil the broth), end in tears, don't you dare, beware. before (noun)
in front, earlier, ahead.
in time (noun)
ago, Since, previously, formerly, back, heretofore, already, facing.
previous time (noun)
antecedence, priority, foregoing, preceding.

prep.

earlier than (preposition)
preceding.

Other synonyms:

Beforetime, apart, then, heretofore, previous, here, Aforetime, Since, beyond, Whenever, across, barely, This, along. already, Until, yet, prior, formerly, sometime, erstwhile, past. first, last, once, when, early. around, all. about. by. back. ahead of time
advance.
gone
ago.
long ago
previously.
Other relevant words:
ahead, to come, someday, yet, about, at one time, This, far-off, heretofore, ago, then, sometime, earlier, early, Aforetime, once, Beforetime, formerly, barely, Since, advance, previous, beyond, later, already, precede, by, across, advanced, apart, when, around, Until, here, back, first, previously, erstwhile, in front, beware, along, last, tomorrow, facing, all, prior, Whenever, past.

Usage examples for before

  1. I will be back before night." – Thankful Rest by Annie S. Swan
  2. He was before her.... – A Fool There Was by Porter Emerson Browne
  3. Yet, how is his evidence put before you? – The Queen Against Owen by Allen Upward