Base Difficulty

Base difficulty: Level 170 edit

Level distribution for noun (animal_grouping_term): 170: 2 278: 3 1399: 5

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: 6583 (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 Starters (1 of 3) 325
cefr A1 (1 of 6) 800

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 7.44 686 5% 12472 downrated 2
20th_books 14.34 389 5% 7061 downrated 2
wiki_math 3.57 1969 5% 8000 capped 2
wiki_geography 29.21 320 5% 4101 downrated 2
wiki_biology 3.13 3375 5% 9000 capped 2
wiki_modern_life 8.65 1585 5% 10000 capped 2
wiki_arts 13.94 658 5% 9447 downrated 2
wiki_society 35.23 290 5% 3092 downrated 2
wiki_linguistics 27.95 372 5% 4636 downrated 2
wiki_physical_science 0.00 — — — 0
wiki_history 20.80 343 5% 5560 downrated 2
early_modern_science 5.24 1748 5% 10400 capped 2
religious_translated 1.21 3396 5% 10400 capped 1
cooking 0.00 — — — 0
legal_scotus 31.27 317 5% 3899 downrated 3
eu_parliament_debates 4.30 2050 5% 11000 capped 2
openstax_science 1.54 3618 5% 11000 capped 1
openstax_society 26.65 370 5% 4886 downrated 2
wpa_life_histories 45.10 152 5% 2778 downrated 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.