Base difficulty: Level 30 edit
Level distribution for noun (time_period): 13: 14 27: 2 30: 13 31: 1 32: 9
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Tier Signals
| Source | Tier | Rank used |
|---|---|---|
basic_english |
Extended (2 of 2) | 1600 |
cambridge_yle |
Movers (2 of 3) | 750 |
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 |
123.97 | 760 | 100% | 648 | 2 |
20th_books |
129.27 | 948 | 100% | 785 | 2 |
wiki_vital |
381.81 | 301 | 100% | 272 | 2 |
wiki_math |
52.03 | 1918 | 100% | 1918 | 1 |
wiki_geography |
250.63 | 564 | 100% | 474 | 2 |
wiki_biology |
356.98 | 373 | 100% | 332 | 2 |
wiki_modern_life |
367.77 | 337 | 100% | 295 | 2 |
early_modern_science |
266.99 | 754 | 100% | 436 | 2 |
religious_translated |
185.69 | 730 | 100% | 592 | 2 |
cooking |
36.26 | 2135 | 100% | 2135 | 1 |
legal_scotus |
198.41 | 676 | 100% | 653 | 2 |
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.