Base Difficulty

Base difficulty: Level 265 edit

Level distribution for noun (mental_construct): 265: 27 300: 1 390: 2 460: 1 1060: 6 1070: 1 1120: 1 1399: 30

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: 463 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Basic (1 of 2) 600
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 282.06 455 100% 357 2
20th_books 245.68 514 100% 415 2
wiki_math 157.06 1208 100% 744 2
wiki_geography 87.43 2960 100% 1564 2
wiki_biology 146.49 1660 100% 951 2
wiki_modern_life 226.71 1096 100% 643 2
wiki_arts 218.05 969 100% 621 2
wiki_society 355.82 539 100% 357 2
wiki_linguistics 220.88 1139 100% 592 2
wiki_physical_science 193.78 1147 100% 747 2
wiki_history 211.04 1046 100% 628 2
early_modern_science 426.39 290 100% 253 2
religious_translated 310.09 381 100% 348 2
cooking 67.61 1469 100% 1469 1
legal_scotus 916.20 203 100% 122 2
eu_parliament_debates 588.79 339 100% 207 2
openstax_science 174.97 1149 100% 788 2
openstax_society 452.22 503 100% 301 2
wpa_life_histories 161.78 733 100% 623 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.