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: 399 (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 Starters (1 of 3) 325
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 420.06 312 100% 245 3
20th_books 207.58 577 100% 470 3
wiki_math 0.00 — — — 0
wiki_geography 1798.46 79 100% 53 3
wiki_biology 646.07 196 100% 168 2
wiki_modern_life 152.42 1302 100% 957 2
wiki_arts 150.23 1755 100% 916 2
wiki_society 134.70 1596 100% 1044 2
wiki_linguistics 69.40 2772 100% 1567 2
wiki_physical_science 426.26 438 100% 318 3
wiki_history 238.67 1048 100% 551 2
early_modern_science 560.15 230 100% 189 3
religious_translated 356.39 364 100% 295 3
cooking 50.69 1753 100% 1753 1
legal_scotus 37.23 5152 100% 2058 3
eu_parliament_debates 156.72 1278 100% 666 3
openstax_science 72.68 1877 100% 1877 1
openstax_society 85.08 2769 100% 1478 2
wpa_life_histories 146.42 849 100% 625 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.