So does glass almost, glass is not a liquid, there are more than 5 stated of matter, a lot more, but glass is still a type of solid. It has some characteristics that recemble the characteristics of a really slow moving liquid.
Well glaciers contain both solid and liquid parts. When you compress ice it turns to liquid. Water isn’t really easy to compress, liquid water can be lower than 0c (freezing), which is called super cooled, and it turns to ice when it’d not compressed anymore. You can make super cooled water or even soda at home, and if you give the bottle a shake it will turn to ice in a couple of seconds. Also the ground under the glacier will be moved together with the ice and water, there is do much force there. When a part of a glacier breaks off it’s called calving, like when a cow gives birth to a calf
Names not fitting botanical definitions are due to the names being given before we (people) knew what we were talking about. DNA kind of came and shook things up, well even before that but what ever.
Also pineapples are neither apples nor grow on pine trees. And in many European languages the word for orange mean apple from China. Example appelsin, where sin in this case comes frome Sina or China