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: 236 (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 Starters (1 of 3) 325
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 1365.45 177 100% 90 2
20th_books 1834.79 130 100% 71 3
wiki_math 105.09 1490 100% 995 2
wiki_geography 0.00 — — — 0
wiki_biology 31.39 3920 100% 3920 1
wiki_modern_life 66.77 2224 100% 2224 1
wiki_arts 224.98 827 100% 593 2
wiki_society 412.59 365 100% 287 2
wiki_linguistics 195.62 1081 100% 662 2
wiki_physical_science 63.25 2247 100% 2247 1
wiki_history 195.68 969 100% 686 2
early_modern_science 736.59 256 100% 145 2
religious_translated 2805.14 59 100% 46 2
cooking 300.86 738 100% 415 2
legal_scotus 187.41 1399 100% 704 2
eu_parliament_debates 581.88 357 100% 212 2
openstax_science 155.85 1198 100% 873 2
openstax_society 440.23 373 100% 291 2
wpa_life_histories 1270.74 184 100% 95 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.