Base Difficulty

Base difficulty: Level 179 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: 770 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Basic (1 of 2) 600
cambridge_yle Flyers (3 of 3) 1200
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 216.65 262 50% 500 downrated 2
20th_books 186.78 306 50% 584 downrated 2
wiki_math 10.39 3496 50% 6992 downrated 1
wiki_geography 145.77 417 50% 834 downrated 1
wiki_biology 173.73 334 50% 668 downrated 1
wiki_modern_life 378.07 117 50% 234 downrated 1
wiki_arts 99.28 641 50% 1282 downrated 1
wiki_society 87.28 745 50% 1490 downrated 1
wiki_linguistics 20.96 2738 50% 5476 downrated 1
wiki_physical_science 450.18 106 50% 212 downrated 1
wiki_history 56.29 1170 50% 2340 downrated 1
early_modern_science 582.82 92 50% 184 downrated 1
religious_translated 86.23 620 50% 1240 downrated 1
cooking 123.95 555 50% 1110 downrated 1
legal_scotus 32.08 1918 50% 3836 downrated 1
eu_parliament_debates 68.95 861 50% 1722 downrated 1
openstax_science 255.18 207 50% 414 downrated 1
openstax_society 50.02 1390 50% 2780 downrated 1
wpa_life_histories 102.85 546 50% 1023 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.