渡船 is read as とせん (tosen) and means a ferry.
とせん
tosen
わたしぶね
ferry
わたりにふね
godsend
とせんじょう
ferry landing
ほんせんわたし
free on board (i.e. seller pays to have goods placed on a ship)
せんそくわたし
free alongside ship
ふなわたし
わたす
to lay across
わたる
to cross over
とらい
visit (from abroad)
わたり
connection
わたし
delivery
わたりどり
migratory bird