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[userinjapan]

例文をジャンル別に表示できる

[dorayakikun]

語彙を増やすためのサイト

[tana005]

これすごいかも

[tekt]

12000語ほどの語彙力を付けるためのサイト

[hasiduki]

楽しい

[snail_nt23]

分からない単語を調べて追加していけるみたいなので、現状これが一番良いかも。

[criticabug]

語の types（下位概念?）, type of（上位概念?）がわかる（dictionary.com 系列ではない）