Base Difficulty

Base difficulty: Level 1399 edit

Level distribution for noun (material_substance): 19: 1 135: 1 179: 25 180: 26 184: 23 278: 2 314: 1 1000: 1 1020: 1 1030: 1 1040: 6 1050: 3 1078: 4 1090: 3 1100: 1 1399: 23

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: 648 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Basic (1 of 2) 600
cefr A2 (2 of 6) 2100

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 39.73 1974 57% 2150 downrated 2
20th_books 30.09 1902 57% 2694 downrated 2
wiki_math 46.61 1811 57% 2013 downrated 2
wiki_geography 76.28 1959 67% 1832 2
wiki_biology 159.59 637 57% 835 downrated 2
wiki_modern_life 678.22 174 67% 141 2
wiki_arts 266.36 480 57% 463 2
wiki_society 179.68 579 57% 721 downrated 2
wiki_linguistics 114.05 1179 57% 1133 2
wiki_physical_science 787.35 126 57% 132 downrated 2
wiki_history 126.76 887 57% 1050 downrated 2
early_modern_science 120.10 1175 57% 972 2
religious_translated 49.39 1181 57% 2067 downrated 1
cooking 144.63 978 57% 820 2
legal_scotus 148.60 823 57% 881 downrated 2
eu_parliament_debates 83.66 1571 57% 1325 2
openstax_science 373.25 265 57% 329 downrated 2
openstax_society 164.93 867 57% 856 2
wpa_life_histories 49.42 1231 57% 1784 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.