Base difficulty: Level 19 edit
Level distribution for noun (chemical_compound): -1: 1 19: 2 24: 5 30: 2
No difficulty overrides set. The base difficulty level will be used for all languages.
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Tier Signals
| Source | Tier | Rank used |
|---|---|---|
basic_english |
Basic (1 of 2) | 600 |
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 |
5.34 | 9027 | 100% | 9027 | 1 |
wiki_vital |
296.61 | 613 | 100% | 414 | 2 |
wiki_math |
0.00 | — | — | — | 0 |
wiki_geography |
0.00 | — | — | — | 0 |
wiki_biology |
393.10 | 432 | 100% | 315 | 2 |
wiki_modern_life |
187.20 | 1103 | 100% | 731 | 2 |
early_modern_science |
850.45 | 140 | 100% | 126 | 2 |
religious_translated |
0.00 | — | — | — | 0 |
cooking |
122.37 | 957 | 100% | 957 | 1 |
legal_scotus |
0.00 | — | — | — | 0 |
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.