palette vs armour plate

palette and armour plate both are nouns.

Word	Noun	Adjective	Verb	Adverb
palette	Yes	No	No	No
armour plate	Yes	No	No	No

As nouns, armour plate is a hypernym of palette; that is, armour plate is a word with a broader meaning than palette:

palette: one of the rounded armor plates at the armpits of a suit of armor
armour plate: specially hardened steel plate used to protect fortifications or vehicles from enemy fire

Other hypernyms of palette include armor plate, armor plating, plate armor, plate armour.

palette (noun)	armour plate (noun)
board that provides a flat surface on which artists mix paints and the range of colors used	specially hardened steel plate used to protect fortifications or vehicles from enemy fire
one of the rounded armor plates at the armpits of a suit of armor
the range of colour characteristic of a particular artist or painting or school of art