Synonyms for Alongside:

adv.

all (adverb)
aboard.

n.

close by, near, shoulder-to-shoulder, along the side, side by side, Beside, close at hand, neck and neck, united, next door, by or at the side of, equal with, on the same plane with, adjacent, next to, close, apace with, almost touching, attached, close to the side, nearby, in company with. simultaneous, as, meanwhile, even as, at the same time, all the time, while, concurrent, when, together. Than, relative, compared with/to, Whereas, the... the..., by/in contrast, relatively, seen against something. alongside (noun)
aboard.

prep.

close, near side of (preposition)
Beside, close at hand, close by, next to, equal with, in company with, side by side, apace with.

Other synonyms:

nearby, adjacent, Beside, next door, attached, together, united. near. close. Other relevant words:
close, in company with, while, close at hand, when, meanwhile, equal with, simultaneous, relative, Beside, together, Than, attached, united, nearby, near, next to, as, side by side, Whereas, next door, adjacent, concurrent, apace with, relatively.

Usage examples for alongside

  1. " Must be scared, to stop eating," put in Tubby, from his position alongside Harry Harkness, on Rob's other side. – The Boy Scouts On The Range by Lieut. Howard Payson
  2. Cameron whirled the team alongside and David jumped out, Smoke at his heels. – Lost Farm Camp by Harry Herbert Knibbs
  3. Presently the khedda elephant was alongside – The Eagle Cliff by R.M. Ballantyne