Base Difficulty

Base difficulty: Level 205 edit

Level distribution for noun (tool): 19: 2 205: 31 460: 2 1000: 15 1040: 13 1050: 1 1078: 5 1090: 2 1203: 1 1209: 1 1210: 7 1216: 1 1221: 1 1222: 2 1224: 8 1399: 4

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: 739 (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 Flyers (3 of 3) 1200
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 53.01 2986 100% 1567 2
20th_books 22.30 5050 100% 2927 2
wiki_math 20.79 3530 100% 3530 1
wiki_geography 31.72 4203 100% 4203 1
wiki_biology 0.00 — — — 0
wiki_modern_life 146.20 1885 100% 1013 2
wiki_arts 1185.70 137 100% 82 2
wiki_society 69.86 3566 100% 1938 2
wiki_linguistics 0.00 — — — 0
wiki_physical_science 134.04 1821 100% 1062 2
wiki_history 85.85 2554 100% 1561 2
early_modern_science 205.41 933 100% 564 2
religious_translated 74.14 1893 100% 1255 2
cooking 0.00 — — — 0
legal_scotus 25.70 5136 100% 2992 2
eu_parliament_debates 323.29 725 100% 366 2
openstax_science 95.59 1931 100% 1327 2
openstax_society 26.46 4293 100% 4293 1
wpa_life_histories 31.15 4351 100% 2362 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.