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: 607 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Basic (1 of 2) 600
cefr B2 (4 of 6) 6900

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 0.00 — — — 0
20th_books 5.26 9566 100% 9566 1
wiki_math 0.00 — — — 0
wiki_geography 0.00 — — — 0
wiki_biology 385.35 458 100% 335 2
wiki_modern_life 184.06 1154 100% 791 2
wiki_arts 0.00 — — — 0
wiki_society 0.00 — — — 0
wiki_linguistics 0.00 — — — 0
wiki_physical_science 1588.37 75 100% 60 2
wiki_history 0.00 — — — 0
early_modern_science 855.40 139 100% 122 2
religious_translated 0.00 — — — 0
cooking 121.67 971 100% 971 1
legal_scotus 0.00 — — — 0
eu_parliament_debates 0.00 — — — 0
openstax_science 1064.09 144 100% 100 2
openstax_society 0.00 — — — 0
wpa_life_histories 8.69 6609 100% 6609 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.