Alongside

• POS: Preposition, Adverb
• HYPHEN: a=long=side

CIDE DICTIONARY

Alongside, adv. 

 Along or by the side; side by side with; -- often with of; as, bring the boat alongside; alongside of him; alongside of the tree.  [1913 Webster]

OXFORD DICTIONARY

Alongside, adv. & prep.
--adv. at or to the side (of a ship, pier, etc.).
--prep. close to the side of; next to.

Idiom

alongside of side by side with; together or simultaneously with.

ROGET THESAURUS

Alongside

Nearness

N nearness, proximity, propinquity, vicinity, vicinage, neighborhood, adjacency, contiguity, short distance, short step, short cut, earshot, close quarters, stone's throw, bow shot, gun shot, pistol shot, hair's breadth, span, purlieus, neighborhood, vicinage, environs, alentours, suburbs, confines, banlieue, borderland, whereabouts, bystander, neighbor, borderer, approach, convergence, perihelion, near, nigh, close at hand, near at hand, close, neighboring, bordering upon, contiguous, adjacent, adjoining, proximate, proximal, at hand, handy, near the mark, near run, home, intimate, near, nigh, hard by, fast by, close to, close upon, hard upon, at the point of, next door to, within reach, within call, within hearing, within earshot, within an ace of, but a step, not far from, at no great distance, on the verge of, on the brink of, on the skirts of, in the environs, at one's door, at one's feet, at one's elbow, at one's finger's end, at one's side, on the tip of one's tongue, under one's nose, within a stone's throw, in sight of, in presence of, at close quarters, cheek by jole, cheek by jowl, beside, alongside, side by side, tete-a-tete, in juxtaposition, yardarm to yardarm, at the heels of, on the confines of, at the threshold, bordering upon, verging to, in the way, about, hereabouts, thereabouts, roughly, in round numbers, approximately, approximatively, as good as, well-nigh.

Parallelism

N parallelism, coextension, equidistance, similarity, parallel, coextensive, equidistant, alongside.

Laterality

N laterality, side, flank, quarter, lee, hand, cheek, jowl, jole, wing, profile, temple, parietes, loin, haunch, hip, beam, gable, gable end, broadside, lee side, points of the compass, East, Orient, Levant, West, orientation, lateral, sidelong, collateral, parietal, flanking, skirting, flanked, sideling, many sided, multilateral, bilateral, trilateral, quadrilateral, Eastern, orient, oriental, Levantine, Western, occidental, Hesperian, sideways, sidelong, broadside on, on one side, abreast, alongside, beside, aside, by the side of, side by side, cheek by jowl, to windward, to leeward, laterally, right and left, on her beam ends, his cheek the may of days outworn.