Great post, there is also a thing called a supercooled liquid, and an amorphous solid. You can consider those also as different states for a material. I wrote about glass, an amorphous solid in a previous article. Check it out if you like!:
https://steemit.com/science/@awesomebiology/is-glass-really-a-solid-material-or-liquid-or-neither
RE: Solids, Liquids and Gases… Is that it? – Part 1