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 |
|---|---|---|
basic_english |
Basic (1 of 2) | 600 |
cefr |
A2 (2 of 6) | 2100 |
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 |
1.16 | 3364 | 5% | 20000 capped | 1 |
20th_books |
0.92 | 3937 | 5% | 20000 capped | 1 |
wiki_math |
10.09 | 700 | 5% | 8000 capped | 2 |
wiki_geography |
23.05 | 427 | 5% | 5415 downrated | 2 |
wiki_biology |
43.30 | 132 | 5% | 2409 downrated | 2 |
wiki_modern_life |
26.28 | 189 | 5% | 3707 downrated | 2 |
wiki_arts |
12.09 | 465 | 5% | 9765 downrated | 1 |
wiki_society |
8.88 | 688 | 5% | 11000 capped | 1 |
wiki_linguistics |
8.31 | 883 | 5% | 9000 capped | 2 |
wiki_physical_science |
28.14 | 245 | 5% | 4440 downrated | 2 |
wiki_history |
4.28 | 1493 | 5% | 9000 capped | 1 |
early_modern_science |
10.16 | 664 | 5% | 10400 capped | 2 |
religious_translated |
0.00 | — | — | — | 0 |
cooking |
9.82 | 639 | 5% | 5200 capped | 1 |
legal_scotus |
7.33 | 912 | 5% | 16816 downrated | 2 |
eu_parliament_debates |
3.79 | 1443 | 5% | 11000 capped | 1 |
openstax_science |
19.46 | 339 | 5% | 6406 downrated | 2 |
openstax_society |
7.69 | 881 | 5% | 11000 capped | 1 |
wpa_life_histories |
11.44 | 477 | 5% | 9327 downrated | 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.