Base Difficulty

Base difficulty: Level 205 edit

Level distribution for noun (machine_part): 185: 4 195: 3 199: 3 200: 1 204: 1 205: 5 330: 1 1078: 2 1399: 13

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: 1235 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Basic (1 of 2) 600
cambridge_yle Flyers (3 of 3) 1200
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 28.09 3843 100% 2572 2
20th_books 48.17 2088 100% 1657 2
wiki_math 0.00 — — — 0
wiki_geography 0.00 — — — 0
wiki_biology 0.00 — — — 0
wiki_modern_life 726.08 242 100% 142 2
wiki_arts 0.00 — — — 0
wiki_society 0.00 — — — 0
wiki_linguistics 0.00 — — — 0
wiki_physical_science 107.93 2486 100% 1285 2
wiki_history 82.23 2539 100% 1619 2
early_modern_science 67.58 2262 100% 1540 2
religious_translated 0.00 — — — 0
cooking 0.00 — — — 0
legal_scotus 19.63 6416 100% 3481 2
eu_parliament_debates 23.80 4991 100% 2551 2
openstax_science 64.83 3008 100% 1792 2
openstax_society 0.00 — — — 0
wpa_life_histories 38.99 2715 100% 2034 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.