Not even your wallet, drivers license, and keys?!?
(sorry, couldn't resist ...)
Some days I don't leave the house, and have no need for those things.
Back to the topic of knife nomenclature:
Words are a short-hand placeholder for objects, concepts, and actions which can be much more fully nuanced than a single word can convey. I can tell you I ate an apple, but without further discussion you would have no idea how it actually tasted, which cultivar, size, color, whether I cut it up first, peeled it, just bit into it. You don't get the sound of the crispness of it, the scent, or whether it had bruises.
But still, you generally knew I didn't eat a banana, and you have an overall shared understanding of what eating a typical apple is like. Your mental picture may be of me biting into a red delicious apple that was sweet and crisp, because it is the fall harvest season and this is the time when apples are at their best. You'd be right if you had that image.
So, in relation to pocket knives. I have three of them sitting on my desk right now. They all fit in my pocket. They all are sharp and can cut things. They all have blades that fold up into their handles. Two of them are acceptable for discussion in this forum, one of them is not. One has metal handles, one has plastic, one bone. All three are textured. All have a single cutting blade. One has several other folding tools that are not blades. All three have some modification of the blade to allow one to grab something to open it. One of them locks open. One of them has a hole through the blade rather than just a shallow slot ground into the blade. One of them has a removable pocket clip.
Lots of work to tell you that. So what I have on my desk is a modern, a SAK, and a slipjoint. Now you know what I have. More details: Benchmade Mini-Griptilian 555HG black, Victorinox silver Alox Cadet, Case Sod Buster Jr Chestnut Bone CV. Now you know exactly what I have, or can look it up.
Modern folder and two slipjoints. I don't particularly care what word everyone uses as a placeholder for the "non-modern, backspring-tensioned folding pocket knife that is OK to talk about on this forum" but we should probably at least have a word for it. Saves typing.