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: 531 (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 128.70 1247 100% 712 2
20th_books 72.78 1819 100% 1175 2
wiki_math 324.52 759 100% 416 2
wiki_geography 346.43 617 100% 374 2
wiki_biology 163.08 1502 100% 849 2
wiki_modern_life 546.82 380 100% 210 2
wiki_arts 398.76 387 100% 296 2
wiki_society 422.50 406 100% 282 2
wiki_linguistics 163.91 1442 100% 784 2
wiki_physical_science 467.88 552 100% 299 2
wiki_history 365.72 601 100% 344 2
early_modern_science 91.50 2211 100% 1195 2
religious_translated 29.42 2997 100% 2997 1
cooking 0.00 — — — 0
legal_scotus 265.73 685 100% 485 2
eu_parliament_debates 255.19 849 100% 468 2
openstax_science 317.52 852 100% 450 2
openstax_society 397.24 539 100% 347 2
wpa_life_histories 54.45 2577 100% 1533 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.