hoy
Small coastal vessel
Hoy is a shout to attract attention, especially at a distance or to hail a boat: Hoy there! Pull alongside!
The word is nautical in flavor but used on land too.
A hoy is also a type of small coastal sailing vessel, now largely historical.
ship
Seagoing transport vessel
deck · port · starboard · mast · rigging · helm · bow · stern · mariner · seafaring
hey
Informal greeting or summons
stop · look · listen · hark · attention · shout · call · exclamation · holler · yell
hoyclipper ship
Fast multi-masted sailing vessel
galleon · ocean liner · tall ship · man-of-war · frigate
Large armed sailing vessel
aircraft carrier · supertanker · capital ship · battleship · galleon