Base Difficulty

Base difficulty: Level 314 edit

Level distribution for noun (chemical_compound): 314: 13 1010: 1 1040: 1 1050: 32 1070: 1 1078: 2 1100: 103 1120: 1 1399: 17

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: 6086 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Basic (1 of 2) 600
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 2.91 3151 11% 20000 capped 1
20th_books 2.03 4088 11% 20000 capped 1
wiki_math 71.80 228 11% 1787 downrated 2
wiki_geography 28.29 593 11% 4568 downrated 2
wiki_biology 30.34 538 11% 4203 downrated 2
wiki_modern_life 26.25 516 11% 4659 downrated 1
wiki_arts 11.27 1346 11% 10000 capped 1
wiki_society 7.50 2057 11% 11000 capped 1
wiki_linguistics 12.95 1106 11% 9000 capped 1
wiki_physical_science 48.70 383 11% 2757 downrated 2
wiki_history 10.52 1395 11% 9000 capped 1
early_modern_science 18.58 1048 11% 6206 downrated 2
religious_translated 2.87 3319 11% 10400 capped 1
cooking 6.24 1642 11% 5200 capped 1
legal_scotus 8.36 2223 11% 13104 downrated 2
eu_parliament_debates 10.30 1584 11% 9822 downrated 2
openstax_science 45.86 384 11% 2805 downrated 2
openstax_society 9.70 2010 11% 11000 capped 2
wpa_life_histories 3.32 2660 11% 20000 capped 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.