Tack (Noun)

A short nail with a sharp point and a large head.

Nouns denoting man-made objects.

The carpenter hammered a tack into the drywall to hang the picture frame.
A box of tacks fell over on the floor, scattering sharp metal everywhere.
The seamstress used a tack to temporarily hold the fabric in place before sewing.
The camper used tacks to secure the ground cloth under the tent.
Make sure to press the tack in firmly so it doesn't come loose over time.

The heading or position of a vessel relative to the trim of its sails.

Nouns denoting spatial position.

As the wind shifted, the sailor adjusted the tack to maximize the vessel's speed.
The captain ordered the crew to come about and change tack to avoid the rocky shoreline.
The helmsman struggled to hold the tack as the gusty winds battled against the sail.
To escape the storm, the navigator recommended a new tack that would take the ship further out to sea.
After surveying the surroundings, the skipper decided to alter the tack to take advantage of the favorable currents.