Base Difficulty

Base difficulty: Level 26 edit

Level distribution for noun (vehicle): 2: 8 26: 3 210: 28 278: 1 1040: 8 1218: 1 1221: 2 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: 928 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
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 40.22 2793 100% 1964 2
20th_books 237.89 532 100% 429 2
wiki_math 34.65 2558 100% 2558 1
wiki_geography 138.70 1817 100% 1015 2
wiki_biology 0.00 — — — 0
wiki_modern_life 319.67 830 100% 427 2
wiki_arts 40.31 3352 100% 3352 1
wiki_society 81.88 2829 100% 1678 2
wiki_linguistics 75.24 1696 100% 1696 1
wiki_physical_science 32.63 3775 100% 3775 1
wiki_history 41.51 3232 100% 3232 1
early_modern_science 0.00 — — — 0
religious_translated 94.46 1365 100% 1032 2
cooking 50.71 1742 100% 1742 1
legal_scotus 120.82 1305 100% 1016 2
eu_parliament_debates 140.45 1573 100% 797 2
openstax_science 169.56 998 100% 800 2
openstax_society 206.68 1130 100% 678 2
wpa_life_histories 278.30 525 100% 381 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.