Base Difficulty

Base difficulty: Level 221 edit

Level distribution for noun (concept_idea): 19: 2 26: 1 27: 1 221: 28 270: 30 274: 30 275: 28 280: 25 300: 1 360: 1 380: 2 1000: 1 1030: 1 1060: 5 1070: 6 1110: 4 1120: 4 1399: 66

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: 2055 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Basic (1 of 2) 600
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 11.41 1762 17% 7591 downrated 2
20th_books 11.53 1853 17% 7345 downrated 2
wiki_math 98.17 408 17% 1400 downrated 2
wiki_geography 61.13 355 17% 1952 downrated 2
wiki_biology 6.55 3334 17% 9000 capped 1
wiki_modern_life 71.10 371 17% 1686 downrated 2
wiki_arts 28.80 1498 17% 4813 downrated 2
wiki_society 87.95 419 17% 1300 downrated 2
wiki_linguistics 110.71 298 17% 1136 downrated 2
wiki_physical_science 27.44 1477 17% 5280 downrated 2
wiki_history 70.01 295 17% 1568 downrated 2
early_modern_science 21.96 1267 17% 5211 downrated 2
religious_translated 53.00 588 17% 2046 downrated 2
cooking 27.42 938 17% 3961 downrated 2
legal_scotus 278.41 83 17% 371 downrated 3
eu_parliament_debates 109.91 247 17% 1094 downrated 2
openstax_science 25.77 1686 17% 5328 downrated 2
openstax_society 86.32 456 17% 1553 downrated 2
wpa_life_histories 12.81 1873 17% 6991 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.