plaquet

is likely misspelled.

has no English definition.

As a noun plaquet

is a strong metal plate used to reinforce the lower part of the breastplate in a suit of plate armor. A placard.

As nouns the difference between plaques and plaquet

is that plaques is plural of lang=en while plaquet is a strong metal plate used to reinforce the lower part of the breastplate in a suit of plate armor. A placard.

As nouns the difference between plaquet and plaque

is that plaquet is a strong metal plate used to reinforce the lower part of the breastplate in a suit of plate armor. A placard while plaque is any flat, thin piece of metal, clay, ivory, or the like, used for ornament, or for painting pictures upon, as a slab, plate, dish, or the like, hung upon a wall; also, a smaller decoration worn on the person, as a brooch.