殺人者: murderer

毟る: pluck (feathers), pick, tear off

分光: a spectrum / 分校: a branch school, a satellite campus / 文公: Duke Wen of Jin (晋文公, Jìn Wén Gōng, 697–628 BCE), a leader of the kingdom of Jin (晉 / 晋) during China's Spring and Autumn Period

分光: to divide light into a spectrum / 聞香: to smell a fragrance

The hiragana syllable りゃ (rya). Its equivalent in katakana is リャ (rya).

両: two / 両: short form of 両個 (ryanko)

Paramushir (an island in Russia)

text, body of a book, document, etc.

duty

(idiomatic) selfishness, self-centeredness