642. Use the following Katakana characters to make one kanji character. ニニロナナナナエロノノ

Answer:

エ  Katakana "E" or KOU, KU - artisan, skill, work

ナ  Katakana "Na"

ニ  Katakana "Ni" or NI, futa(tsu), futa - two

ノ  Katakana "No"

ロ  Katakana "Ro"

Arrange them like this: 

講  KOU - club, lesson, study