One way to hold this word: a tube, plus water doing an important job inside it. The two meanings are two different objects that both fit that description — in one, the water is the thing being carried from place to place; in the other, the water sits still in a container and the smoke has to pass through it.
這個字的畫面可以想成：一根管子，加上「水在裡面扮演關鍵角色」這個條件。兩個意思其實是兩種不同的東西，但都符合這個描述。一種裡面的水是被輸送的貨物，從水廠一路送到你家；另一種裡面的水安安靜靜待在底座，煙必須穿過它才能被吸進去。
From the word’s history
Wiktionary records the compound from Middle English waterpype, analysed on the surface as water + pipe.
根據 Wiktionary，這個複合字在中古英語就寫成 waterpype，拆開來看就是 water（水）加 pipe（管子）。字面上的組合一直沒變，變的只是水在管子裡做什麼。
Wiktionary, "water pipe"
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