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: 624 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Basic (1 of 2) 600

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 49.44 2132 100% 1669 2
20th_books 26.29 3086 100% 3086 1
wiki_math 96.74 1265 100% 1265 1
wiki_geography 334.42 442 100% 376 2
wiki_biology 154.71 1180 100% 886 2
wiki_modern_life 477.13 221 100% 210 2
wiki_arts 137.14 976 100% 976 1
wiki_society 210.49 598 100% 598 1
wiki_linguistics 154.82 857 100% 857 1
wiki_physical_science 802.56 172 100% 142 2
wiki_history 85.94 1573 100% 1573 1
early_modern_science 538.14 273 100% 202 2
religious_translated 27.07 3196 100% 3196 1
cooking 0.00 — — — 0
legal_scotus 142.44 918 100% 918 1
eu_parliament_debates 388.51 316 100% 316 1
openstax_science 458.53 315 100% 272 2
openstax_society 171.81 819 100% 819 1
wpa_life_histories 22.19 3335 100% 3335 1

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.