Base difficulty: Level 135 edit
Level distribution for noun (natural_feature): 10: 2 11: 1 135: 25 165: 1 219: 26 254: 1 330: 1 1010: 1 1020: 7 1050: 9 1221: 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 |
23.27 | 1928 | 50% | 3856 downrated | 1 |
20th_books |
24.71 | 1785 | 50% | 3570 downrated | 1 |
wiki_math |
0.00 | — | — | — | 0 |
wiki_geography |
15.63 | 4233 | 50% | 8466 downrated | 1 |
wiki_biology |
12.89 | 4477 | 50% | 8954 downrated | 1 |
wiki_modern_life |
34.74 | 2142 | 50% | 4284 downrated | 1 |
wiki_arts |
17.35 | 3817 | 50% | 7634 downrated | 1 |
wiki_society |
0.00 | — | — | — | 0 |
wiki_linguistics |
0.00 | — | — | — | 0 |
wiki_physical_science |
292.34 | 204 | 50% | 384 downrated | 2 |
wiki_history |
16.47 | 3977 | 50% | 7954 downrated | 1 |
early_modern_science |
128.08 | 423 | 50% | 846 downrated | 1 |
religious_translated |
0.00 | — | — | — | 0 |
cooking |
0.00 | — | — | — | 0 |
legal_scotus |
6.37 | 5949 | 50% | 11898 downrated | 1 |
eu_parliament_debates |
11.20 | 3477 | 50% | 6954 downrated | 1 |
openstax_science |
171.33 | 395 | 50% | 726 downrated | 2 |
openstax_society |
0.00 | — | — | — | 0 |
wpa_life_histories |
8.81 | 3973 | 50% | 7946 downrated | 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.