And you would fall into the same mistake that people who complain about the word do. It’s a literary or old-fashioned word. The word you would want in casual conversation is ホームシック, which you won’t learn on WaniKani because it’s not written with kanji.
It’s very common for new users to want to use every word they learn here in conversation, but teaching vocabulary for conversation is not the objective of WaniKani. The objective here is to learn how to read kanji, and you may indeed encounter that word when reading, and WK will have been helpful.