Base Difficulty

Base difficulty: Level 135 edit

Level distribution for noun (natural_feature): 10: 2 11: 1 135: 25 165: 1 219: 26 254: 1 330: 1 1010: 1 1020: 7 1050: 9 1221: 1 1399: 6

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: 1922 (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 Movers (2 of 3) 750
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 27.97 972 17% 3354 downrated 2
20th_books 32.28 997 17% 3057 downrated 2
wiki_math 321.31 84 17% 373 downrated 2
wiki_geography 36.66 1192 17% 3773 downrated 2
wiki_biology 36.83 947 17% 3751 downrated 2
wiki_modern_life 92.06 223 17% 1126 downrated 2
wiki_arts 32.13 961 17% 4212 downrated 2
wiki_society 61.43 462 17% 1991 downrated 2
wiki_linguistics 37.37 802 17% 3489 downrated 2
wiki_physical_science 258.27 74 17% 368 downrated 2
wiki_history 42.04 693 17% 3114 downrated 2
early_modern_science 31.56 939 17% 3644 downrated 2
religious_translated 38.16 733 17% 2804 downrated 2
cooking 0.00 — — — 0
legal_scotus 9.14 2361 17% 11300 downrated 2
eu_parliament_debates 53.11 472 17% 2258 downrated 2
openstax_science 128.89 185 17% 871 downrated 2
openstax_society 42.95 789 17% 3292 downrated 2
wpa_life_histories 35.04 783 17% 2831 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.