If a singular noun already ends in 's', you don't need to add another 's'. You can just add an apostrophe at the end. Plural nouns refer to more than one person or thing, for example 'brothers'.

Answers will never be plurals. Letters can appear twice or even ... Wordle answer is a noun. It contains two vowels. Wordle solution starts with 'D'. Wordle answer has no repeating letter.