Base Difficulty

Base difficulty: Level 265 edit

Level distribution for noun (mental_construct): 265: 27 300: 1 390: 2 460: 1 1060: 6 1070: 1 1120: 1 1399: 30

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: 3998 (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 17.47 1029 17% 5171 downrated 2
20th_books 20.68 949 17% 4541 downrated 2
wiki_math 2.89 3933 17% 8000 capped 1
wiki_geography 18.35 2482 17% 7538 downrated 2
wiki_biology 9.74 2337 17% 9000 capped 1
wiki_modern_life 29.27 1019 17% 4837 downrated 2
wiki_arts 35.74 814 17% 3722 downrated 2
wiki_society 87.16 293 17% 1322 downrated 2
wiki_linguistics 10.75 1966 17% 9000 capped 1
wiki_physical_science 21.00 1620 17% 6644 downrated 2
wiki_history 31.03 997 17% 4309 downrated 2
early_modern_science 21.39 887 17% 5322 downrated 1
religious_translated 7.23 2177 17% 10400 capped 1
cooking 8.08 1793 17% 5200 capped 1
legal_scotus 15.99 1507 17% 7409 downrated 2
eu_parliament_debates 34.88 655 17% 3245 downrated 2
openstax_science 41.21 739 17% 3371 downrated 2
openstax_society 124.77 221 17% 970 downrated 2
wpa_life_histories 22.33 1042 17% 4371 downrated 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.