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 |
cambridge_yle |
Movers (2 of 3) | 750 |
cefr |
A1 (1 of 6) | 800 |
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 |
92.69 | 1083 | 100% | 966 | 2 |
20th_books |
120.93 | 914 | 100% | 778 | 2 |
wiki_math |
0.00 | — | — | — | 0 |
wiki_geography |
167.86 | 1044 | 100% | 810 | 2 |
wiki_biology |
54.44 | 2500 | 100% | 2500 | 1 |
wiki_modern_life |
44.68 | 3232 | 100% | 3232 | 1 |
wiki_arts |
0.00 | — | — | — | 0 |
wiki_society |
26.38 | 4825 | 100% | 4825 | 1 |
wiki_linguistics |
0.00 | — | — | — | 0 |
wiki_physical_science |
165.41 | 874 | 100% | 874 | 1 |
wiki_history |
0.00 | — | — | — | 0 |
early_modern_science |
125.62 | 1086 | 100% | 890 | 2 |
religious_translated |
159.92 | 667 | 100% | 667 | 1 |
cooking |
27.04 | 2587 | 100% | 2587 | 1 |
legal_scotus |
0.00 | — | — | — | 0 |
eu_parliament_debates |
0.00 | — | — | — | 0 |
openstax_science |
26.17 | 4196 | 100% | 4196 | 1 |
openstax_society |
19.82 | 5264 | 100% | 5264 | 1 |
wpa_life_histories |
115.53 | 1034 | 100% | 805 | 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.