different between headboard vs stadiometer

English

head +? board

headboard (plural headboards)

A vertical panel, either plain or upholstered, attached to the head of a bed.
(nautical) A panel, usually of metal, attached to the head of a fore-and-aft sail for additional strength.
(rail transport) A board on the front of a train, carrying the train's name or that of the service it is on.
A grave marker made of wood.

(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.)

stadiometer (plural stadiometers)

A device, having a vertical scale and a movable headboard, for measuring a person's height
A self-recording theodolite.

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