hatchway

As nouns the difference between hatchway and sash

is that hatchway is a means of passing through a wall or floor, having a hatch (especially on a ship); a doorway with a hatch rather than a door while sash is a decorative length of cloth worn as a broad belt or over the shoulder, often for ceremonial or other formal occasions or sash can be the opening part of a window usually containing the glass panes, hinged to the jamb, or sliding up and down as in a sash window.

As a verb sash is

to adorn with a sash or scarf.

As a noun hatchway

is a means of passing through a wall or floor, having a hatch (especially on a ship); a doorway with a hatch rather than a door.

As an adjective undefined is

lacking a definition or value.

As nouns the difference between manhole and hatchway

is that manhole is a hole in the ground used to access the sewers or other underground vaults and installations while hatchway is a means of passing through a wall or floor, having a hatch (especially on a ship); a doorway with a hatch rather than a door.

As nouns the difference between hatchway and companionway

is that hatchway is a means of passing through a wall or floor, having a hatch (especially on a ship); a doorway with a hatch rather than a door while companionway is a staircase or ladder from one deck to another on a ship.