They are all very similar words and can often be exchanged for one another without too much confusion. However, there are subtle differences, i.e. to apprehend, to arrest, to take into custody and to put in detention are all quite formal and do suggest that it was done by a police officer or similar to another human being, whereas anyone can "capture" or "catch" someone or something else, i.e. I could say that I caught a stray dog or that I captured a spider in my bedroom (although capture can sound mean). However, in that situation, to say that I arrested or apprehended the stray dog might sound overly formal or a bit inappropriate In short, they are all similar, but "catch" and "capture" (and to some extent "apprehend") are much less formal and can be used for other things. Hope that helps! If you need any further explanation, feel free to message me!