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: 266 (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 99.57 600 44% 974 downrated 2
20th_books 68.99 796 44% 1391 downrated 2
wiki_math 805.85 76 44% 146 downrated 2
wiki_geography 299.02 238 44% 378 downrated 2
wiki_biology 695.95 86 44% 142 downrated 2
wiki_modern_life 510.87 104 44% 182 downrated 2
wiki_arts 708.17 81 44% 129 downrated 2
wiki_society 628.88 88 44% 142 downrated 2
wiki_linguistics 1493.07 60 44% 75 downrated 2
wiki_physical_science 990.20 54 44% 95 downrated 2
wiki_history 239.75 248 44% 450 downrated 2
early_modern_science 527.34 138 44% 197 downrated 2
religious_translated 310.13 236 44% 380 downrated 2
cooking 279.96 314 44% 520 downrated 2
legal_scotus 143.02 528 44% 889 downrated 2
eu_parliament_debates 174.24 457 44% 700 downrated 2
openstax_science 743.28 76 44% 129 downrated 2
openstax_society 374.42 197 44% 312 downrated 2
wpa_life_histories 48.50 1140 44% 1963 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.