How do you pronounce 電報船? Is is でんぽうふね、でんぽうぶね or でんぽうせん?


I recently started to read 'Made in Abyss' and unfortunately is doesn't
contain any furigana, which sometimes makes it hard for me to understand. So I
came across the word 電報船, which refers to a mail ship, but since rendaku is a
thing in japanese, the ふね might become ぶね. Or せん? Does anybody now how to
pronounce the word properly (and why)?




Looks like 電報船 is a made-up term that is unique to this manga, but since 電報 is
an on-on compound (i.e., a kango), people usually expect 船 to be read せん, too.
As [this answer](https://japanese.stackexchange.com/a/2529/5010) explains, せん
is an on-reading and thus will not be voiced into ぜん.

  * On + せん: 連絡船【れんらくせん】, 貨物船【かもつせん】, 宇宙船【うちゅうせん】
  * Kun + ぶね: 屋形船【やかたぶね】, 箱船【はこぶね】, 乗合船【のりあいぶね】

That said, since this is a made-up term, it may have an unpredictable unique
reading, so ultimately you have to look for the official reading. I found a
seiyu read the term actually as でんぽうせん in [this radio
archive](https://www.youtube.com/watch?v=pPlbAaUnFZo&feature=youtu.be&t=1526).

