High-frequency and Low-frequency Words
Nation (2001, 2013) divides vocabulary into frequency bands based on how often Word Families occur in large corpora. This classification has profound implications for curriculum design: the most frequent 2,000–3,000 word families deserve intensive teaching; beyond that, learners need strategies rather than direct instruction.
Nation's Frequency Bands
| Band | Word families | Approximate text coverage | Teaching implication |
|---|---|---|---|
| High-frequency (1K–3K) | ~3,000 | ~85–90% of general text | Teach explicitly; ensure mastery |
| Mid-frequency (4K–9K) | ~6,000 | ~5–8% | Teach through extensive reading + strategies |
| Low-frequency (10K+) | Tens of thousands | ~2–5% | Learn incidentally; not worth direct teaching |
| Academic (AWL) | ~570 families | ~10% of academic text | Teach explicitly for academic learners |
Coverage Figures
Nation (2006) provides the following cumulative coverage estimates for written text:
- 1st 1,000 families: 78–81%
- 2nd 1,000 families: adds 8–9% (cumulative ~88%)
- 3rd 1,000 families: adds 3–5% (cumulative ~92%)
- 4th–5th 1,000: adds ~3%
- 6th–9th 1,000: adds ~2%
The 95% threshold — the minimum for adequate reading comprehension — requires roughly 5,000 word families plus proper nouns. The 98% threshold — reading for pleasure with minimal dictionary use — requires 8,000–9,000 families (Nation 2006; Hu & Nation 2000).
The Vocabulary Gap
The gap between high-frequency and low-frequency vocabulary creates a pedagogical challenge. The first 2,000–3,000 families are manageable through direct instruction. The next 6,000 families (mid-frequency) are individually less useful but collectively essential. Low-frequency words are vast in number but each one is rarely encountered. This is why Vocabulary Learning Strategies — word parts, contextual guessing, dictionary skills — become increasingly important beyond the high-frequency band.
Teaching Implications
- Prioritise ruthlessly — High-frequency words first; they deliver the greatest return
- Use Frequency Lists to guide vocabulary selection for materials and syllabuses
- The Academic Word List fills a specific niche for EAP/IELTS learners
- Beyond 3K, invest in strategies and extensive reading rather than word lists
- Learner awareness — Help learners understand that not all words are equally worth learning