What type of vocabulary incorporates letters that correspond to their most common pronunciation?

The answer identifies regular words as the type of vocabulary that incorporates letters corresponding to their most common pronunciation. Regular words follow conventional spelling patterns and sound out predictably, which makes them easier to decode for reading and pronunciation. This systematic relationship between letters and sounds helps learners develop their phonics skills, enabling them to read unfamiliar words more confidently.

Phonetic words refer specifically to words that follow strict phonetic spelling rules, often used in instructional contexts. While they sound highly systematic, the term "regular words" is more encompassing, as it includes words that adhere to common phonetic rules without adhering to a narrow definition of phonetics. Compound words are formed by combining two or more smaller words, and multisyllabic words include those with multiple syllables, which can be regular or irregular in their pronunciation. Therefore, regular words represent a broader category that exemplifies the common pronunciation of letters, making them the correct choice.