Synonyms for Before:

adv.

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

n.

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

prep.

earlier than (preposition)
preceding.

Other synonyms:

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

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