Base Difficulty

Base difficulty: Level 14 edit

Level distribution for adverb (adverb_other): 6: 1 14: 2 17: 1 23: 1 105: 1 1130: 1

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: 373 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Extended (2 of 2) 1600
cambridge_yle Flyers (3 of 3) 1200
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 872.01 143 100% 143 1
20th_books 851.87 155 100% 155 1
wiki_math 145.52 923 100% 923 1
wiki_geography 238.78 523 100% 523 1
wiki_biology 340.60 346 100% 346 1
wiki_modern_life 285.97 396 100% 396 1
wiki_arts 225.97 550 100% 550 1
wiki_society 204.97 616 100% 616 1
wiki_linguistics 212.28 628 100% 628 1
wiki_physical_science 229.67 613 100% 613 1
wiki_history 300.51 376 100% 376 1
early_modern_science 466.25 216 100% 216 1
religious_translated 289.96 380 100% 380 1
cooking 487.92 316 100% 316 1
legal_scotus 216.15 585 100% 585 1
eu_parliament_debates 409.03 295 100% 295 1
openstax_science 379.03 331 100% 331 1
openstax_society 324.91 385 100% 385 1
wpa_life_histories 555.49 214 100% 214 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.