Base difficulty: Level 219 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 |
|---|---|---|
basic_english |
Extended (2 of 2) | 1600 |
cambridge_yle |
Flyers (3 of 3) | 1200 |
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 |
55.77 | 1880 | 100% | 1510 | 2 |
20th_books |
33.86 | 2461 | 100% | 2461 | 1 |
wiki_math |
0.00 | — | — | — | 0 |
wiki_geography |
33.21 | 4039 | 100% | 4039 | 1 |
wiki_biology |
82.73 | 2551 | 100% | 1566 | 2 |
wiki_modern_life |
0.00 | — | — | — | 0 |
wiki_arts |
104.08 | 1781 | 100% | 1301 | 2 |
wiki_society |
23.56 | 5251 | 100% | 5251 | 1 |
wiki_linguistics |
0.00 | — | — | — | 0 |
wiki_physical_science |
80.71 | 2714 | 100% | 1604 | 2 |
wiki_history |
0.00 | — | — | — | 0 |
early_modern_science |
18.98 | 4728 | 100% | 4728 | 1 |
religious_translated |
46.80 | 2060 | 100% | 2060 | 1 |
cooking |
0.00 | — | — | — | 0 |
legal_scotus |
0.00 | — | — | — | 0 |
eu_parliament_debates |
0.00 | — | — | — | 0 |
openstax_science |
0.00 | — | — | — | 0 |
openstax_society |
34.28 | 3498 | 100% | 3498 | 1 |
wpa_life_histories |
47.36 | 2034 | 100% | 1678 | 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.