Base difficulty: Level 329 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 |
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 |
44.04 | 2005 | 100% | 2005 | 1 |
20th_books |
46.06 | 2125 | 100% | 1736 | 2 |
wiki_math |
18.43 | 3825 | 100% | 3825 | 1 |
wiki_geography |
40.54 | 3358 | 100% | 3358 | 1 |
wiki_biology |
0.00 | — | — | — | 0 |
wiki_modern_life |
46.17 | 3127 | 100% | 3127 | 1 |
wiki_arts |
50.40 | 2748 | 100% | 2748 | 1 |
wiki_society |
73.33 | 1917 | 100% | 1917 | 1 |
wiki_linguistics |
31.50 | 3361 | 100% | 3361 | 1 |
wiki_physical_science |
37.23 | 3429 | 100% | 3429 | 1 |
wiki_history |
61.04 | 2244 | 100% | 2244 | 1 |
early_modern_science |
0.00 | — | — | — | 0 |
religious_translated |
53.18 | 1854 | 100% | 1854 | 1 |
cooking |
0.00 | — | — | — | 0 |
legal_scotus |
14.16 | 5617 | 100% | 5617 | 1 |
eu_parliament_debates |
440.00 | 273 | 100% | 273 | 1 |
openstax_science |
61.05 | 2169 | 100% | 2169 | 1 |
openstax_society |
74.34 | 1866 | 100% | 1866 | 1 |
wpa_life_histories |
26.77 | 2899 | 100% | 2899 | 1 |
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.