This noun follows the standard English plural rule: simply add -s to the singular form.
Challenged is regular. It follows the Standard -s rule.
Use plural verbs: "The challengeds are ready" (not "is ready").
Yes. The plural challengeds is standard across all English variants.
The word challenged follows the standard English pluralization rule. When forming the plural, challenged becomes challengeds. This follows the Standard -s pattern, which is one of the most common plural rules in English.
Understanding why challenged becomes challengeds helps with spelling and pronunciation. This noun follows the standard English plural rule: simply add -s to the singular form.
When using challengeds in writing, remember that it functions as a plural noun in sentences. It pairs with plural verbs and pronouns. For example: "The challengeds are ready" (not "is ready"). This subject-verb agreement is essential for grammatical correctness.