粪便
fèn biàn · HSK 7
excrement
💩 FEN sounds like fen/swamp + BIAN sounds like bee-on -- swamp stuff
粪 (fèn) means dung or manure, 便 (biàn) means convenience or something discharged. Together they form the formal/medical term for feces. Think: fen as in a boggy fen, plus bian as a convenient compound.
粪 — rice 米 + different 异 (top: 田)
Originally a pictograph showing two hands holding a winnowing basket dumping rice husks and waste, meaning 'to sweep away refuse.' Over time it came to mean the refuse itself, especially excrement or manure. The modern form combines 米 (rice) with a simplified element from the older shape.
便 — person 亻 + change 更
A semantic compound: 亻(person) beside 更 (to change/replace). The original sense was a person making things easier or more convenient by adjusting them. From 'convenient' it extended to 'then/thereupon' (biàn) and to bodily 'discharge' (as in 大便).