The vowel digraph “oi” represents a distinct diphthong, a sound formed by the combination of two vowels in a single syllable. This sound, similar to the “oy” in “toy,” appears in numerous English words, such as “join,” “boil,” and “coin.” These terms span various parts of speech, functioning as nouns, verbs, and adjectives.
This particular vowel combination plays a significant role in English pronunciation and spelling. Its presence can alter word meanings and distinguish between homophones (words that sound alike but have different meanings and spellings). Historically, the “oi” digraph has evolved through various linguistic influences, reflecting changes in pronunciation over time. Understanding its usage strengthens reading comprehension and enhances vocabulary development.