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: 1407 (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 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 94.60 1220 97% 943 2
20th_books 113.53 1076 97% 815 2
wiki_math 76.03 2094 97% 1228 2
wiki_geography 0.00 — — — 0
wiki_biology 101.53 2334 97% 1332 2
wiki_modern_life 229.34 1052 97% 629 2
wiki_arts 140.77 1813 97% 981 2
wiki_society 0.00 — — — 0
wiki_linguistics 0.00 — — — 0
wiki_physical_science 329.91 643 97% 435 2
wiki_history 0.00 — — — 0
early_modern_science 152.54 1192 97% 757 2
religious_translated 0.00 — — — 0
cooking 71.09 2061 97% 1109 2
legal_scotus 5.50 9319 97% 9599 downrated 1
eu_parliament_debates 0.00 — — — 0
openstax_science 236.70 959 97% 594 2
openstax_society 0.00 — — — 0
wpa_life_histories 199.90 756 97% 500 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.