Nouns ending in a consonant followed by -y change the -y to -ies in the plural form.
Severity is regular. It follows the -ies Conversion rule.
Use plural verbs: "The severities are ready" (not "is ready").
Yes. The plural severities is standard across all English variants.
The word severity follows the standard English pluralization rule. When forming the plural, severity becomes severities. This follows the -ies Conversion pattern, which is one of the most common plural rules in English.
Understanding why severity becomes severities helps with spelling and pronunciation. Nouns ending in a consonant followed by -y change the -y to -ies in the plural form.
When using severities in writing, remember that it functions as a plural noun in sentences. It pairs with plural verbs and pronouns. For example: "The severities are ready" (not "is ready"). This subject-verb agreement is essential for grammatical correctness.