Base difficulty: Level 1050 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
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Tier Signals
| Source | Tier | Rank used |
|---|---|---|
basic_english |
Extended (2 of 2) | 1600 |
cefr |
B1 (3 of 6) | 4200 |
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 |
2.29 | 9987 | 44% | 20000 capped | 1 |
20th_books |
0.00 | — | — | — | 0 |
wiki_math |
15.87 | 2519 | 44% | 5668 downrated | 1 |
wiki_geography |
0.00 | — | — | — | 0 |
wiki_biology |
123.99 | 950 | 44% | 1124 downrated | 2 |
wiki_modern_life |
76.29 | 1501 | 44% | 1940 downrated | 2 |
wiki_arts |
0.00 | — | — | — | 0 |
wiki_society |
0.00 | — | — | — | 0 |
wiki_linguistics |
110.57 | 760 | 44% | 1183 downrated | 2 |
wiki_physical_science |
434.87 | 127 | 44% | 239 downrated | 2 |
wiki_history |
0.00 | — | — | — | 0 |
early_modern_science |
83.32 | 916 | 44% | 1373 downrated | 2 |
religious_translated |
7.13 | 4709 | 44% | 10400 capped | 1 |
cooking |
0.00 | — | — | — | 0 |
legal_scotus |
5.76 | 8275 | 44% | 9760 downrated | 2 |
eu_parliament_debates |
0.00 | — | — | — | 0 |
openstax_science |
232.40 | 405 | 44% | 570 downrated | 2 |
openstax_society |
0.00 | — | — | — | 0 |
wpa_life_histories |
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.