Nouns ending in -s, -x, -z, -ch, or -sh add -es to form the plural. This makes the word easier to pronounce.
Thesaurus is regular. It follows the -es Addition rule.
Use plural verbs: "The thesauruses are ready" (not "is ready").
Yes. The plural thesauruses is standard across all English variants.
The word thesaurus follows the standard English pluralization rule. When forming the plural, thesaurus becomes thesauruses. This follows the -es Addition pattern, which is one of the most common plural rules in English.
Understanding why thesaurus becomes thesauruses helps with spelling and pronunciation. Nouns ending in -s, -x, -z, -ch, or -sh add -es to form the plural. This makes the word easier to pronounce.
When using thesauruses in writing, remember that it functions as a plural noun in sentences. It pairs with plural verbs and pronouns. For example: "The thesauruses are ready" (not "is ready"). This subject-verb agreement is essential for grammatical correctness.