What type of vocabulary includes high-frequency words used by mature language users across several content areas?

The correct answer is that the type of vocabulary that includes high-frequency words used by mature language users across several content areas is referred to as Tier Two Vocabulary.

Tier Two Vocabulary consists of words that are more sophisticated than everyday conversational language (Tier One) but not as specialized as the technical language found in specific subjects (Tier Three). These words often describe concepts that are common across different fields and are essential for effective communication and comprehension in academic settings. Familiarity with Tier Two words enhances students' reading skills and helps them express ideas more precisely.

In educational contexts, emphasizing Tier Two Vocabulary is important for developing literacy because it bridges the gap between basic conversational skills and advanced, subject-specific language, aiding students in becoming more versatile and articulate readers and writers.