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 |
6.99 | 8242 | 100% | 8242 | 1 |
20th_books |
6.10 | 8714 | 100% | 8714 | 1 |
wiki_math |
0.00 | — | — | — | 0 |
wiki_geography |
593.14 | 190 | 100% | 181 | 2 |
wiki_biology |
234.94 | 985 | 100% | 595 | 2 |
wiki_modern_life |
76.32 | 3241 | 100% | 1850 | 2 |
wiki_arts |
26.18 | 4868 | 100% | 4868 | 1 |
wiki_society |
27.08 | 4713 | 100% | 4713 | 1 |
wiki_linguistics |
0.00 | — | — | — | 0 |
wiki_physical_science |
392.53 | 442 | 100% | 347 | 2 |
wiki_history |
36.64 | 3603 | 100% | 3603 | 1 |
early_modern_science |
217.46 | 615 | 100% | 501 | 2 |
religious_translated |
0.00 | — | — | — | 0 |
cooking |
0.00 | — | — | — | 0 |
legal_scotus |
6.88 | 8408 | 100% | 8408 | 1 |
eu_parliament_debates |
105.75 | 1128 | 100% | 1128 | 1 |
openstax_science |
39.87 | 3057 | 100% | 3057 | 1 |
openstax_society |
69.80 | 1963 | 100% | 1963 | 1 |
wpa_life_histories |
15.10 | 4466 | 100% | 4466 | 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.