“Bowstring” is approximately the 67,700th most common word in the Gutenberg corpus, “bow-string” is not found in the 100K! Each is used once, and in very different settings. I am intrigued that Bilbo’s word that he thinks of internally to indicate his state of anxiety is not hyphenated, while the name for the tool that Bard used is. Not a Shire word, then, yet expressed as a specialty word that Tolkien (translator) had no word for – different from a bow-string. Perhaps the greater bow of a mighty man had a different sort of string.
- 05.127 Bilbo could see or feel that he was tense as a bowstring,
- 14.021 Then Bard drew his bow-string to his ear.