Keystone vs. Capstone

Difference Between Keystone and Capstone
Keystonenoun
(architecture) The top stone of an arch.
Capstonenoun
Any of the stones making up the top layer of a wall; a coping stone.
Keystonenoun
Something on which other things depend for support.
Capstonenoun
(figurative) A crowning achievement, culmination or finishing touch.
Keystonenoun
A native or resident of the American state of Pennsylvania.
Capstonenoun
a final touch; a crowning achievement; a culmination
Keystonenoun
(retail) A retail price that is double the cost price; a markup of 100%.
Capstonenoun
a stone that forms the top of wall or building
Keystoneverb
(transitive) To distort (an image) by projecting it onto a surface at an angle, which for example causes a square to look like a trapezoid.
Keystoneverb
To double the cost price in order to determine the retail price; to apply a markup of 100%.
Keystonenoun
a central cohesive source of support and stability;
faith is his anchorthe keystone of campaign reform was the ban on soft moneyhe is the linchpin of this firmKeystonenoun
the central building block at the top of an arch or vault