Base difficulty: Level 25 edit
Level distribution for verb (development): 25: 14 27: 1 29: 1
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Tier Signals
| Source | Tier | Rank used |
|---|---|---|
basic_english |
Extended (2 of 2) | 1600 |
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 |
19.17 | 2224 | 50% | 3943 downrated | 1 |
20th_books |
22.54 | 2329 | 50% | 3168 downrated | 2 |
wiki_vital |
239.22 | 500 | 50% | 497 | 3 |
wiki_math |
79.74 | 839 | 50% | 1510 downrated | 1 |
wiki_geography |
101.10 | 1564 | 50% | 1221 | 3 |
wiki_biology |
66.89 | 1483 | 50% | 2048 downrated | 2 |
wiki_modern_life |
228.28 | 474 | 50% | 546 downrated | 3 |
early_modern_science |
46.61 | 1231 | 50% | 2339 downrated | 1 |
religious_translated |
48.24 | 1052 | 50% | 1932 downrated | 1 |
cooking |
15.30 | 2407 | 50% | 4275 downrated | 1 |
legal_scotus |
250.14 | 325 | 50% | 475 downrated | 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.