Base difficulty: Level 30 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 |
|---|---|---|
basic_english |
Basic (1 of 2) | 600 |
cefr |
A2 (2 of 6) | 2100 |
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 |
42.47 | 901 | 20% | 1894 downrated | 4 |
20th_books |
90.47 | 553 | 20% | 1017 downrated | 4 |
wiki_math |
0.00 | — | — | — | 0 |
wiki_geography |
70.25 | 1599 | 20% | 2016 downrated | 3 |
wiki_biology |
53.04 | 3432 | 100% | 2407 | 2 |
wiki_modern_life |
175.94 | 842 | 50% | 799 | 4 |
wiki_arts |
109.91 | 1509 | 50% | 1263 | 3 |
wiki_society |
133.42 | 908 | 50% | 1019 downrated | 3 |
wiki_linguistics |
17.20 | 3162 | 50% | 6324 downrated | 1 |
wiki_physical_science |
0.00 | — | — | — | 0 |
wiki_history |
115.49 | 1220 | 50% | 1168 | 3 |
early_modern_science |
41.99 | 2075 | 20% | 2317 downrated | 3 |
religious_translated |
5.03 | 3423 | 20% | 10400 capped | 1 |
cooking |
0.00 | — | — | — | 0 |
legal_scotus |
31.92 | 3492 | 50% | 2808 | 3 |
eu_parliament_debates |
99.40 | 693 | 50% | 1047 downrated | 3 |
openstax_science |
86.74 | 1351 | 50% | 1466 downrated | 3 |
openstax_society |
114.83 | 1241 | 50% | 1183 | 3 |
wpa_life_histories |
118.31 | 455 | 20% | 825 downrated | 4 |
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.