Most nouns ending in -o add -es to form the plural (with some exceptions like photo/photos).
Who is regular. It follows the -es Addition rule.
Use plural verbs: "The whoes are ready" (not "is ready").
Yes. The plural whoes is standard across all English variants.
The word who follows the standard English pluralization rule. When forming the plural, who becomes whoes. This follows the -es Addition pattern, which is one of the most common plural rules in English.
Understanding why who becomes whoes helps with spelling and pronunciation. Most nouns ending in -o add -es to form the plural (with some exceptions like photo/photos).
When using whoes in writing, remember that it functions as a plural noun in sentences. It pairs with plural verbs and pronouns. For example: "The whoes are ready" (not "is ready"). This subject-verb agreement is essential for grammatical correctness.