pillar vs cap

pillar and cap both are nouns.

Word	Noun	Adjective	Verb	Adverb
pillar	Yes	No	No	No
cap	Yes	No	Yes	No

pillar (noun)	cap (noun)
(architecture) a tall vertical cylindrical structure standing upright and used to support a structure	a tight-fitting headdress
a vertical cylindrical structure standing alone and not supporting anything (such as a monument)	the upper part of a column that supports the entablature
a fundamental principle or practice	a top (as for a bottle)
a prominent supporter	something serving as a cover or protection
anything that approximates the shape of a column or tower	(dentistry) dental appliance consisting of an artificial crown for a broken or decayed tooth
	a mechanical or electrical explosive device or a small amount of explosive; can be used to initiate the reaction of a disrupting explosive
	an upper limit on what is allowed
	a protective covering that is part of a plant
	a fruiting structure resembling an umbrella or a cone that forms the top of a stalked fleshy fungus such as a mushroom

pillar (verb)	cap (verb)
	restrict the number or amount of
	lie at the top of