Base difficulty: Level 278 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 |
B1 (3 of 6) | 4200 |
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 |
33.23 | 3912 | 100% | 2140 | 3 |
20th_books |
35.65 | 3759 | 50% | 1966 | 3 |
wiki_math |
0.00 | — | — | — | 0 |
wiki_geography |
29.09 | 4473 | 100% | 4473 | 1 |
wiki_biology |
858.36 | 202 | 100% | 133 | 4 |
wiki_modern_life |
65.91 | 2255 | 100% | 2255 | 1 |
wiki_arts |
0.00 | — | — | — | 0 |
wiki_society |
0.00 | — | — | — | 0 |
wiki_linguistics |
0.00 | — | — | — | 0 |
wiki_physical_science |
32.63 | 3773 | 100% | 3773 | 1 |
wiki_history |
0.00 | — | — | — | 0 |
early_modern_science |
107.07 | 1637 | 50% | 973 | 4 |
religious_translated |
25.26 | 4380 | 100% | 3035 | 2 |
cooking |
0.00 | — | — | — | 0 |
legal_scotus |
0.00 | — | — | — | 0 |
eu_parliament_debates |
0.00 | — | — | — | 0 |
openstax_science |
28.26 | 3964 | 100% | 3964 | 1 |
openstax_society |
0.00 | — | — | — | 0 |
wpa_life_histories |
26.89 | 3849 | 50% | 2499 | 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.