Terminology is always an important thing - and especially in textiles, it can be a real nightmare. There's a lot of terms that are used differently in a professional and in a casual/everyday setting, and then there's regional differences, and then there's different uses of the same term in different disciplines, and that's not even starting with the issues that can arise in translations to other languages.
To make things at least a little bit easier, terminology lists and glossaries exist. There's several of them, of course, and they may also differ from each other. One of the probably better-known ones is the list compiled and hosted by the CIETA, the Centre International d'Etude des Textiles Anciens. If you think it might be helpful for you, or if you're just curious, check the lists out here.