@claire-h Hi Claire. 😀 Welcome to the forum. Thanks for pointing out that the introduce yourself section still mentions guilds. Apparently we forgot to remove that text. 😛 Guilds were something we used to have on the forum.
Word war groups are groups that compete against each other one week a month to write the most words. You can join one by going to Forum > Groups, and then if you click on one of the word war groups there will be a link in the description for where you can apply.