Okay, the user wants me to translate "word-class" into Thai. Let me check the rules again. The first rule says to translate all content into Thai. The second rule states if it's already in Thai, leave it as is. The third rule is to provide only the translation without explanations.
So, "word-class" is in English. I need to translate it. The term "word-class" in linguistics refers to categories like nouns, verbs, etc. In Thai, the equivalent term is "ประเภทของคำ" which literally means "type of word." I should make sure that's the correct translation. Let me confirm. Yes, "ประเภทของคำ" is the standard term used in Thai linguistic contexts. No need for explanations, just the translation. Alright, that's it.