Base Difficulty

Base difficulty: Level 274 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: 2530 (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 Movers (2 of 3) 750
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 32.97 1287 33% 2721 downrated 2
20th_books 24.40 2213 33% 3468 downrated 2
wiki_math 39.27 1728 33% 2730 downrated 2
wiki_geography 37.74 2259 33% 3690 downrated 2
wiki_biology 23.33 3473 33% 5442 downrated 2
wiki_modern_life 89.03 905 33% 1595 downrated 2
wiki_arts 21.25 2189 33% 6567 downrated 1
wiki_society 11.14 4051 33% 11000 capped 1
wiki_linguistics 15.23 3910 33% 6269 downrated 2
wiki_physical_science 326.23 235 33% 369 downrated 2
wiki_history 30.77 2354 33% 4381 downrated 2
early_modern_science 99.60 613 33% 1124 downrated 2
religious_translated 25.55 2017 33% 3654 downrated 2
cooking 0.00 — — — 0
legal_scotus 0.00 — — — 0
eu_parliament_debates 3.86 5206 33% 11000 capped 1
openstax_science 203.51 367 33% 640 downrated 2
openstax_society 33.07 2395 33% 3963 downrated 2
wpa_life_histories 14.42 3173 33% 5511 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.