Base difficulty: Level 470 edit
Level distribution for verb (development): 30: 1 165: 2 170: 1 179: 1 196: 1 249: 1 278: 1 299: 2 300: 1 329: 1 470: 7 475: 1 1399: 6
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Tier Signals
| Source | Tier | Rank used |
|---|---|---|
cefr |
B1 (3 of 6) | 4200 |
Rank used = synthetic rank this tier contributes to the combined frequency rank (lower = more common).
Corpus Frequency
| Corpus | Freq (per M) | Best form | Share | Zipf rank | Forms |
|---|---|---|---|---|---|
19th_books |
154.41 | 1418 | 100% | 566 | 4 |
20th_books |
90.66 | 2326 | 100% | 863 | 4 |
wiki_math |
148.98 | 1401 | 100% | 684 | 3 |
wiki_geography |
53.74 | 2556 | 100% | 2556 | 1 |
wiki_biology |
58.45 | 2333 | 100% | 2333 | 1 |
wiki_modern_life |
212.97 | 1431 | 100% | 686 | 3 |
wiki_arts |
124.55 | 2462 | 100% | 1089 | 3 |
wiki_society |
149.97 | 1963 | 100% | 923 | 3 |
wiki_linguistics |
36.54 | 2996 | 100% | 2996 | 1 |
wiki_physical_science |
85.85 | 2842 | 100% | 1526 | 2 |
wiki_history |
216.11 | 1295 | 100% | 619 | 3 |
early_modern_science |
187.56 | 1416 | 100% | 583 | 4 |
religious_translated |
83.81 | 2471 | 100% | 1046 | 3 |
cooking |
0.00 | — | — | — | 0 |
legal_scotus |
179.31 | 1605 | 100% | 645 | 4 |
eu_parliament_debates |
103.48 | 1959 | 100% | 894 | 3 |
openstax_science |
121.77 | 2012 | 100% | 1004 | 3 |
openstax_society |
185.19 | 1856 | 100% | 730 | 3 |
wpa_life_histories |
29.58 | 4335 | 100% | 2445 | 2 |
Best form = the single best-ranked form in the corpus, share-blind — how the spelling itself ranked. Share = how much of that spelling belongs to this lemma, when several senses compete for it. Zipf rank = all the forms combined (variant spellings included), each scaled by its share, and what feeds the combined frequency rank. Combining forms improves on the best form, but a share below 100% pushes the other way and usually wins: a sense holding a small slice of a common spelling is a rare word, so its rank lands downrated below the best form — and once it falls past what the corpus can support it is capped at the rank an unlisted word would get.