船窓 is read as せんそう (sensou) and means porthole.
せんそう
sensou
せんちょう
boatman
ふなびん
ferry service
ふね
counter for boat-shaped containers (e.g. of sashimi)
せんしゅ
shipowner
せんぷく
side or bottom of a ship
ふなたび
trip by boat
せんしつ
stateroom
ふなで
setting sail
せんたい
hull
せんいん
sailor
bow (of boat)
ふながいしゃ
steamship (shipping) company