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: 1377 (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 60.05 459 20% 1665 downrated 2
20th_books 45.31 596 20% 2219 downrated 2
wiki_math 173.23 158 20% 738 downrated 2
wiki_geography 40.20 626 20% 3130 downrated 1
wiki_biology 143.46 176 20% 758 downrated 2
wiki_modern_life 81.32 278 20% 1310 downrated 2
wiki_arts 81.01 308 20% 1354 downrated 2
wiki_society 124.75 169 20% 773 downrated 2
wiki_linguistics 156.39 162 20% 764 downrated 2
wiki_physical_science 75.20 397 20% 1764 downrated 2
wiki_history 94.83 273 20% 1158 downrated 2
early_modern_science 82.09 307 20% 1329 downrated 2
religious_translated 84.24 309 20% 1300 downrated 2
cooking 66.26 455 20% 2275 downrated 1
legal_scotus 169.28 141 20% 630 downrated 2
eu_parliament_debates 159.68 150 20% 727 downrated 2
openstax_science 71.65 388 20% 1755 downrated 2
openstax_society 98.30 249 20% 1160 downrated 2
wpa_life_histories 47.41 626 20% 2195 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.