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When we talk about Germanic words, it is certainly clear that these words have Indo-European origin and we can find cognates in other IE languages.
Soap was invented in the West Asia about 5,000 years ago, the first concrete evidence we have of soap-like substance is dated around 2800 BC in Mesopotamia. The word
sapu with the similar meaning of "to bath" and "dyer" exists in Akkadian too and for this reason some linguists believe that the Latin word has an Akkadian origin:
https://books.google.com/books?id=zI...page&q&f=false
But the semantic development of the Germanic word shows that this word has a Germanic origin and Akkadian, Arabic, Hebrew and other Semitic words have been borrowed from Germanic.
We see similar thing about Arabic
burj "fortress, tower":
https://en.wiktionary.org/wiki/%D8%A8%D8%B1%D8%AC Borrowed from Classical Syriac ܒܘܪܓܐ (burgāʾ), from
burg in Middle Persian, or from Ancient Greek πύργος (púrgos).
About the Greek word:
https://en.wiktionary.org/wiki/%CF%8...#Ancient_Greek The word is first attested in Homer, Iliad 7.206. Believed to be a borrowed word, probably from Urartian (burgana, “palace, fortress”), Kretschmer suggested a borrowing from Proto-Germanic *burgz (“fortified town, hill-fort”).
This word has certainly a Germanic origin, the ancient Urartian word is also a loanword from Germanic.