They are all very similar and could probably be used interchangeably in most situations. The following descriptions are how they differ and why I might choose each of the words over the others: "grasp"- this is when you are trying to grab/hold onto something. You reach out and try to grasp it, but it may take effort to reach it and it may not be completely in your control- you only have it with your fingers, not fully in your hand. You can also "grasp" a concept or idea. You think you understand it, but are not sure you understand it completely. "grip"- is to hold on tightly to something. On the train, I grip the handle that hangs above my head, or I grip the metal pole to keep from falling if the train stops suddenly. A grip can also be a noun. When it is a noun, it may be something you use to grip a jar better so you can open the lid. The handle on a bicycle may have a special grip (design or texture) to make it easier or more comfortable to hold. "grab"- generally I think of grabbing someone's arm and holding on or pulling their arm after grabbing. I might grab a child by the arms to keep them from walking in front of a car. "clutch" - When I clutch something, I hold it under my armpit or hold it in one hand, like a book or wallet, where the item is larger than my hand and I may not get my hand all the way around it. A clutch can also be a noun, One clutch is the peddle you press with your foot when driving a car with manual drive (stick shift) to release the gears. Another clutch is a purse that does not have a strap. You hold it under your armpit or clutch it in your hands.