Base Difficulty

Base difficulty: Level 6 edit

Level distribution for noun (time_period): 6: 4 22: 25 220: 15 405: 3 1030: 2 1050: 1 1070: 1 1120: 4 1200: 1 1202: 2 1399: 14

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: 101 (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 600.29 258 100% 177 3
20th_books 785.33 223 100% 146 3
wiki_math 277.55 807 100% 479 2
wiki_geography 2335.92 62 100% 38 2
wiki_biology 1856.56 71 100% 52 2
wiki_modern_life 1316.61 113 100% 70 2
wiki_arts 1269.25 114 100% 77 2
wiki_society 1158.64 130 100% 82 2
wiki_linguistics 515.73 346 100% 248 2
wiki_physical_science 1389.73 96 100% 72 2
wiki_history 2456.96 55 100% 34 2
early_modern_science 1167.74 130 100% 89 2
religious_translated 787.62 234 100% 150 2
cooking 165.60 1194 100% 650 2
legal_scotus 824.47 201 100% 136 2
eu_parliament_debates 1688.77 119 100% 68 3
openstax_science 817.38 165 100% 136 2
openstax_society 1668.94 91 100% 62 2
wpa_life_histories 2907.03 63 100% 45 3

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.