Base Difficulty

Base difficulty: Level 10 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: 414 (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 161.63 682 94% 561 3
20th_books 224.31 546 94% 443 3
wiki_math 0.00 — — — 0
wiki_geography 2909.97 57 100% 31 4
wiki_biology 270.76 1206 100% 516 3
wiki_modern_life 216.97 1599 94% 677 3
wiki_arts 118.54 1822 100% 1162 2
wiki_society 147.86 2229 100% 935 3
wiki_linguistics 259.48 705 100% 487 3
wiki_physical_science 373.38 807 94% 390 3
wiki_history 362.10 534 100% 343 3
early_modern_science 385.88 391 94% 285 3
religious_translated 213.99 817 94% 491 2
cooking 0.00 — — — 0
legal_scotus 86.73 2051 100% 1208 3
eu_parliament_debates 29.25 3938 94% 2326 2
openstax_science 30.17 3646 94% 3865 downrated 1
openstax_society 179.70 1192 100% 739 3
wpa_life_histories 539.87 306 94% 205 3

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.