Base difficulty: Level 475 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 |
C2 (6 of 6) | 20000 |
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 |
77.96 | 1442 | 80% | 1100 | 3 |
20th_books |
52.84 | 1886 | 80% | 1595 | 2 |
wiki_math |
16.63 | 3565 | 80% | 4456 downrated | 1 |
wiki_geography |
50.35 | 2241 | 80% | 2801 downrated | 1 |
wiki_biology |
0.00 | — | — | — | 0 |
wiki_modern_life |
0.00 | — | — | — | 0 |
wiki_arts |
0.00 | — | — | — | 0 |
wiki_society |
23.06 | 4528 | 80% | 5660 downrated | 1 |
wiki_linguistics |
0.00 | — | — | — | 0 |
wiki_physical_science |
0.00 | — | — | — | 0 |
wiki_history |
165.47 | 726 | 80% | 774 downrated | 2 |
early_modern_science |
129.09 | 1255 | 80% | 864 | 3 |
religious_translated |
47.38 | 2906 | 80% | 1871 | 2 |
cooking |
0.00 | — | — | — | 0 |
legal_scotus |
25.10 | 5231 | 80% | 2842 | 3 |
eu_parliament_debates |
64.34 | 2384 | 80% | 1501 | 2 |
openstax_science |
0.00 | — | — | — | 0 |
openstax_society |
51.59 | 3353 | 80% | 2309 | 2 |
wpa_life_histories |
19.00 | 4881 | 80% | 3647 | 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.