Base Difficulty

Base difficulty: Level 162 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: 767 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Extended (2 of 2) 1600
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 35.87 2445 100% 2445 1
20th_books 22.51 3511 100% 3511 1
wiki_math 23.10 3336 100% 3336 1
wiki_geography 78.88 1794 100% 1794 1
wiki_biology 188.34 857 100% 709 2
wiki_modern_life 389.66 289 100% 271 2
wiki_arts 62.11 2240 100% 2240 1
wiki_society 73.57 1910 100% 1910 1
wiki_linguistics 33.86 3201 100% 3201 1
wiki_physical_science 951.58 113 100% 105 2
wiki_history 83.24 1632 100% 1632 1
early_modern_science 164.02 675 100% 675 1
religious_translated 0.00 — — — 0
cooking 0.00 — — — 0
legal_scotus 34.20 3948 100% 2537 2
eu_parliament_debates 165.74 780 100% 670 2
openstax_science 880.24 120 100% 112 2
openstax_society 153.77 1257 100% 887 2
wpa_life_histories 10.98 6109 100% 6109 1

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.