やく
role, part
The part you are handed and then walk out to go and do. He gets the detective more often than not, and a yak やく could play the other one: やく.
一部 いちぶ and 部分 ぶぶん are a part of something. 役 is a part you play.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.