Base Difficulty

Base difficulty: Level 221 edit

Level distribution for noun (concept_idea): 19: 2 26: 1 27: 1 221: 28 270: 30 274: 30 275: 28 280: 25 300: 1 360: 1 380: 2 1000: 1 1030: 1 1060: 5 1070: 6 1110: 4 1120: 4 1399: 66

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: 361 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Basic (1 of 2) 600
cefr A2 (2 of 6) 2100

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 61.18 1845 100% 1389 2
20th_books 57.63 1833 100% 1433 2
wiki_math 2576.55 75 100% 45 2
wiki_geography 140.34 1365 100% 983 2
wiki_biology 235.25 542 100% 542 1
wiki_modern_life 330.41 526 100% 389 2
wiki_arts 206.48 1209 100% 671 2
wiki_society 619.68 261 100% 180 2
wiki_linguistics 267.10 966 100% 488 2
wiki_physical_science 657.89 288 100% 201 2
wiki_history 172.06 1117 100% 772 2
early_modern_science 131.37 861 100% 861 1
religious_translated 68.72 1494 100% 1494 1
cooking 131.84 914 100% 914 1
legal_scotus 301.35 512 100% 412 2
eu_parliament_debates 367.28 631 100% 323 2
openstax_science 1043.15 200 100% 103 2
openstax_society 635.76 343 100% 198 2
wpa_life_histories 48.85 1904 100% 1904 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.