船檣 is read as せんしょう (senshou) and means mast.
せんしょう
senshou
せんちょう
boatman
ふなびん
ferry service
ふなばし
bridge (of a ship)
せんてい
ship's bottom
ふね
counter for boat-shaped containers (e.g. of sashimi)
せんぱく
vessel
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
ふなよい
seasickness
ふなで
setting sail