barbed wire vs barb

barbed wire and barb both are nouns.

Word	Noun	Adjective	Verb	Adverb
barbed wire	Yes	No	No	No
barb	Yes	No	Yes	No

barbed wire (noun)	barb (noun)
strong wire with barbs at regular intervals used to prevent passage	one of the parallel filaments projecting from the main shaft of a feather
	a subsidiary point facing opposite from the main point that makes an arrowhead or spear hard to remove
	the pointed part of barbed wire
	an aggressive remark directed at a person like a missile and intended to have a telling effect

barbed wire (verb)	barb (verb)
	provide with barbs