side pocket(n = noun.artifact) - a pocket on the side of a billiard table;
is a kind of pocket

air pocket, blind side, breast pocket, bright side, corner pocket, credit side, crown side, debit side, deep pocket, distaff side, dwarf pocket rat, east side, flip side, hip pocket, hispid pocket mouse, lee side, leeward side, mexican pocket mouse, north side, northern pocket gopher, on the far side, on the side, other side, out of pocket, patch pocket, plains pocket gopher, plains pocket mouse, pocket, pocket battleship, pocket billiards, pocket book, pocket borough, pocket bread, pocket calculator, pocket comb, pocket dictionary, pocket edition, pocket flap, pocket flask, pocket gopher, pocket knife, pocket lighter, pocket money, pocket mouse, pocket rat, pocket veto, pocket watch, side, side arm, side by side, side chair, side chapel, side dish, side door, side drum, side effect, side entrance, side horse, side issue, side judge, side line, side of bacon, side of beef, side of meat, side of pork, side road, side slip, side street, side view, side with, side yard, silky pocket mouse, slash pocket, south side, southeastern pocket gopher, spear side, spindle side, sword side, top side, upper side, valley pocket gopher, vest pocket, watch pocket, water pocket, weather side, west side, windward side