Base Difficulty

Base difficulty: Level 135 edit

Level distribution for noun (physical_phenomenon): 135: 3 162: 4 179: 1 219: 1 221: 1 274: 2 275: 2 280: 1 285: 1 290: 2 300: 2 350: 1 380: 1 400: 1 440: 2 1399: 12

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: 2514 (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 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 74.42 305 20% 1413 downrated 2
20th_books 60.75 368 20% 1666 downrated 2
wiki_math 0.00 — — — 0
wiki_geography 28.99 1234 20% 4721 downrated 2
wiki_biology 22.30 1254 20% 6270 downrated 1
wiki_modern_life 64.49 397 20% 1799 downrated 2
wiki_arts 18.10 1537 20% 7685 downrated 1
wiki_society 37.56 797 20% 3480 downrated 2
wiki_linguistics 5.80 3535 20% 9000 capped 1
wiki_physical_science 43.58 880 20% 3289 downrated 2
wiki_history 23.50 1116 20% 5580 downrated 1
early_modern_science 69.63 338 20% 1545 downrated 2
religious_translated 150.21 176 20% 831 downrated 2
cooking 249.03 130 20% 650 downrated 1
legal_scotus 5.42 3707 20% 18535 downrated 1
eu_parliament_debates 7.67 3423 20% 9629 downrated 2
openstax_science 10.81 2390 20% 11000 capped 1
openstax_society 20.34 1367 20% 6835 downrated 1
wpa_life_histories 85.19 306 20% 1339 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.