Base Difficulty

Base difficulty: Level 370 edit

Level distribution for noun (shape): 4: 12 12: 2 370: 13 1080: 3 1120: 1 1399: 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: 1143 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Basic (1 of 2) 600
cefr B1 (3 of 6) 4200

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 28.87 4011 100% 2516 2
20th_books 20.61 4970 100% 3088 2
wiki_math 1308.28 153 100% 101 2
wiki_geography 0.00 — — — 0
wiki_biology 49.42 2729 100% 2729 1
wiki_modern_life 237.07 771 100% 585 2
wiki_arts 63.82 4066 100% 2054 2
wiki_society 0.00 — — — 0
wiki_linguistics 25.63 3815 100% 3815 1
wiki_physical_science 275.10 677 100% 519 2
wiki_history 0.00 — — — 0
early_modern_science 148.77 1273 100% 777 2
religious_translated 0.00 — — — 0
cooking 0.00 — — — 0
legal_scotus 0.00 — — — 0
eu_parliament_debates 0.00 — — — 0
openstax_science 220.96 854 100% 630 2
openstax_society 0.00 — — — 0
wpa_life_histories 18.30 5096 100% 3228 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.