ʻAe, pololei! Yes, that's correct! Most words don't change in spelling or pronunciation when made plural. It just so happens that wāhine (and some other words like it) are exceptions to the rule. We have already seen wahine -> wāhine. A couple more examples are kaikamahine -> kaikamāhine and makua -> mākua. Definitely check out the Tips & Notes section (the lightbulb button that appears when you click on a skill, on the web only, unfortunately) for more grammar-related info.