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: 496 (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 181.44 575 100% 534 2
20th_books 140.72 758 100% 684 2
wiki_math 337.23 506 100% 382 2
wiki_geography 179.46 953 100% 754 2
wiki_biology 153.34 891 100% 891 1
wiki_modern_life 393.10 370 100% 301 2
wiki_arts 242.82 705 100% 538 2
wiki_society 330.71 522 100% 384 2
wiki_linguistics 455.73 351 100% 280 2
wiki_physical_science 402.62 422 100% 337 2
wiki_history 443.74 311 100% 254 2
early_modern_science 345.13 390 100% 317 2
religious_translated 49.55 1962 100% 1962 1
cooking 41.69 1990 100% 1990 1
legal_scotus 352.76 383 100% 344 2
eu_parliament_debates 639.47 226 100% 196 2
openstax_science 358.25 502 100% 382 2
openstax_society 369.55 623 100% 380 2
wpa_life_histories 83.58 1355 100% 1096 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.