picket fence vs picket

picket fence and picket both are nouns.

Word	Noun	Adjective	Verb	Adverb
picket fence	Yes	No	No	No
picket	Yes	No	Yes	No

picket fence (noun)	picket (noun)
a fence made of upright pickets	a form of military punishment used by the British in the late 17th century in which a soldier was forced to stand on one foot on a pointed stake
	a wooden strip forming part of a fence
	a vehicle performing sentinel duty
	a detachment of troops guarding an army from surprise attack
	a protester posted by a labor organization outside a place of work
	a person employed to keep watch for some anticipated event

picket fence (verb)	picket (verb)
	fasten with a picket
	serve as pickets or post pickets