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: 3137 (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 17.59 1237 20% 5015 downrated 2
20th_books 16.98 1452 20% 5272 downrated 2
wiki_math 42.02 1136 20% 3031 downrated 2
wiki_geography 21.76 1902 20% 6407 downrated 2
wiki_biology 38.30 1105 20% 3642 downrated 2
wiki_modern_life 68.63 420 20% 1760 downrated 2
wiki_arts 47.36 886 20% 2843 downrated 2
wiki_society 59.24 604 20% 2198 downrated 2
wiki_linguistics 17.84 2130 20% 6572 downrated 2
wiki_physical_science 94.52 377 20% 1419 downrated 2
wiki_history 31.90 804 20% 4044 downrated 1
early_modern_science 51.71 499 20% 2087 downrated 2
religious_translated 51.41 727 20% 2079 downrated 2
cooking 0.00 — — — 0
legal_scotus 25.99 1370 20% 4795 downrated 2
eu_parliament_debates 44.23 677 20% 2583 downrated 2
openstax_science 92.29 387 20% 1420 downrated 2
openstax_society 70.92 554 20% 1949 downrated 2
wpa_life_histories 24.28 1027 20% 3984 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.