Base Difficulty

Base difficulty: Level 1399 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

Per-Language Difficulty Overrides

No difficulty overrides set. The base difficulty level will be used for all languages.

Add Difficulty Override
-1 to exclude, 1-1399 for level
Frequency and Tier Signals
Combined Frequency Rank: 3960 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals

No lemma-tier assignment found yet.

Corpus Frequency
Corpus Freq (per M) Best form Share Zipf rank Forms
19th_books 4.26 3405 10% 18698 downrated 2
20th_books 4.00 3449 10% 19212 downrated 2
wiki_math 178.97 133 10% 718 downrated 2
wiki_geography 6.55 2148 10% 9000 capped 1
wiki_biology 9.49 2082 10% 9000 capped 2
wiki_modern_life 34.18 549 10% 3802 downrated 2
wiki_arts 52.69 245 10% 2075 downrated 2
wiki_society 29.51 586 10% 4371 downrated 2
wiki_linguistics 33.05 585 10% 4015 downrated 2
wiki_physical_science 120.28 135 10% 881 downrated 2
wiki_history 20.28 893 10% 6551 downrated 2
early_modern_science 27.40 549 10% 4035 downrated 2
religious_translated 7.15 1756 10% 10400 capped 2
cooking 0.00 — — — 0
legal_scotus 34.86 743 10% 3745 downrated 2
eu_parliament_debates 19.19 1088 10% 6139 downrated 2
openstax_science 62.88 268 10% 1952 downrated 2
openstax_society 17.72 1046 10% 7733 downrated 2
wpa_life_histories 1.97 4744 10% 20000 capped 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.