Cap

a tight-fitting headdress

a top (as for a bottle)

a mechanical or electrical explosive device or a small amount of explosive

something serving as a cover or protection

a fruiting structure resembling an umbrella or a cone that forms the top of a stalked fleshy fungus such as a mushroom

a protective covering that is part of a plant

an upper limit on what is allowed

(dentistry) dental appliance consisting of an artificial crown for a broken or decayed tooth

the upper part of a column that supports the entablature

lie at the top of

restrict the number or amount of