【Slide】 ,  【slip】 ,  【glide】 ,  【skid】 ,  【glissade】 ,  【slither】 ,  【coast】 ,  【toboggan】  can mean to move along easily and smoothly over or as if over a surface.

【Slide】 usually implies accelerating motion and continuous contact with a smooth and slippery surface; it is used not only in reference to persons and to moving things (as vehicles), but also, especially in extended use, with reference to things which pass rapidly before one because of one's own swift and easy motion or which move easily, unobtrusively, or gradually from one place or condition to another.

【Slip】  carries a stronger implication than  【slide】 of a frictionless and unobstructed surface but a weaker suggestion of continued contact; it typically suggests involuntary rather than voluntary sliding, often definitely implying a loss of footing and a fall.

When only swift, easy motion is implied,  【slip】 heightens the emphasis upon quietness, stealth, or skillfulness. Things are said to  【slip】 that pass quickly or without notice (as from one's grasp, one's control, one's memory, or one's observation) or as a result of one's negligence or inattention.

【Glide】  comes closer to  【slide】  than to  【slip】 in its stress upon such continued smooth, easy, usually silent motion as is characteristic of some dances, but it may or may not imply unintermittent contact with a surface and, apart from its context, it seldom carries any suggestion of danger.

Often, like  【slide】  and, to a lesser extent,  【slip】  ,  【glide】 is used in reference to things that apparently move because the observer is moving.

【Skid】 is employed especially in regard to wheeled vehicles the tires of which on an icy, wet, or dusty road fail to grip the roadway, thereby causing the wheels to 【slide】 without rotating and the vehicle to go out of control. In extended use  【skid】  , like  【slip】 , usually implies an element of danger or recklessness or a lack of complete control or grasp.

【Glissade】 , basically a mountaineering term implying a long 【slide】 down a snowcovered slope, carries the major implications of both  【slide】  and  【glide】 but stresses skillful technique and control.

In extended reference to things  【glissade】  tends to lose its implication of skill and differs little from  【slide】  ,  【slip】  , or  【glide】 .

【Slither】 typically implies a sliding down or along a rocky, pebbly, or other rough surface with noise and clatter or it may suggest a gliding, sliding, sometimes undulating motion suggestive of a snake's movement.

Both  【coast】  and  【toboggan】  basically imply a downward movement (as of a sled or 【toboggan】 ) on a smooth or slippery course under the influence of gravity and thereby come close to  【slide】  and  【glide】 .

But they differ in their extended use, for  【coast】 usually stresses movement in the absence of continuously applied force (as of momentum or gravity) and often suggests an easy drifting while  【toboggan】 is likely to stress a building up of momentum and a resulting wild speed in a usually uncontrollable downward movement.