bar vs bars

bar and bars both are nouns.

Word	Noun	Adjective	Verb	Adverb
bar	Yes	No	Yes	No
bars	Yes	No	No	No

bar (noun)	bars (noun)
the act of preventing	gymnastic apparatus consisting of two parallel wooden rods supported on uprights
a rigid piece of metal or wood; usually used as a fastening or obstruction or weapon
an obstruction (usually metal) placed at the top of a goal
a room or establishment where alcoholic drinks are served over a counter
a counter where you can obtain food or drink
a block of solid substance (such as soap or wax)
(law) a railing that encloses the part of the courtroom where the judges and lawyers sit and the case is tried
a heating element in an electric fire
a horizontal rod that serves as a support for gymnasts as they perform exercises
a narrow marking of a different color or texture from the background
musical notation for a repeating pattern of musical beats
the body of individuals qualified to practice law in a particular jurisdiction
a submerged (or partly submerged) ridge in a river or along a shore
(meteorology) a unit of pressure equal to a million dynes per square centimeter

bar (verb)	bars (verb)
prevent from entering; keep out
render unsuitable for passage
secure with, or as if with, bars
expel, as if by official decree