Why the plural form of tomato is tomatoes but piano is not?

The plural form of "tomato" is "tomatoes" because it follows a specific rule for Words ending in a vowel followed by "o," where an "es" is added to form the plural. In contrast, "piano" simply adds an "s" to become "pianos," as it does not follow the same vowel-consonant ending pattern. These variations are due to the different origins and rules of English spelling and pronunciation.