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 |
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 |
32.26 | 3089 | 97% | 2353 | 2 |
20th_books |
48.60 | 2915 | 97% | 1508 | 3 |
wiki_math |
473.17 | 363 | 97% | 275 | 3 |
wiki_geography |
519.18 | 314 | 97% | 237 | 3 |
wiki_biology |
804.98 | 313 | 97% | 153 | 4 |
wiki_modern_life |
947.77 | 126 | 97% | 106 | 3 |
wiki_arts |
665.23 | 192 | 97% | 161 | 3 |
wiki_society |
762.69 | 201 | 97% | 144 | 4 |
wiki_linguistics |
716.91 | 211 | 97% | 170 | 3 |
wiki_physical_science |
592.19 | 387 | 97% | 231 | 4 |
wiki_history |
491.03 | 303 | 97% | 234 | 3 |
early_modern_science |
78.89 | 1441 | 97% | 1484 downrated | 1 |
religious_translated |
0.00 | — | — | — | 0 |
cooking |
0.00 | — | — | — | 0 |
legal_scotus |
145.01 | 1836 | 97% | 767 | 4 |
eu_parliament_debates |
559.16 | 461 | 97% | 216 | 3 |
openstax_science |
736.78 | 467 | 97% | 186 | 4 |
openstax_society |
726.00 | 374 | 97% | 181 | 4 |
wpa_life_histories |
46.99 | 2851 | 97% | 1605 | 3 |
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.