rail vs bar

rail and bar both are nouns.

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

As nouns, bar is a hypernym of rail; that is, bar is a word with a broader meaning than rail:

rail: a horizontal bar (usually of wood or metal)
bar: a rigid piece of metal or wood; usually used as a fastening or obstruction or weapon

As nouns, bar is a hypernym of rail; that is, bar is a word with a broader meaning than rail:

rail: a bar or pair of parallel bars of rolled steel making the railway along which railroad cars or other vehicles can roll
bar: a rigid piece of metal or wood; usually used as a fastening or obstruction or weapon

As nouns, bar is a hyponym of rail; that is, bar is a word with a more specific, narrower meaning than rail:

rail: a barrier consisting of a horizontal bar and supports
bar: (law) a railing that encloses the part of the courtroom where the judges and lawyers sit and the case is tried

Other hyponyms of rail include fife rail, guardrail, safety rail, taffrail.

rail (noun)	bar (noun)
any of numerous widely distributed small wading birds of the family Rallidae having short wings and very long toes for running on soft mud	the act of preventing
a horizontal bar (usually of wood or metal)	a rigid piece of metal or wood; usually used as a fastening or obstruction or weapon
a bar or pair of parallel bars of rolled steel making the railway along which railroad cars or other vehicles can roll	an obstruction (usually metal) placed at the top of a goal
a barrier consisting of a horizontal bar and supports	a room or establishment where alcoholic drinks are served over a counter
short for railway	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

rail (verb)	bar (verb)
complain bitterly	prevent from entering; keep out
spread negative information about	render unsuitable for passage
criticize severely	secure with, or as if with, bars
fish with a handline over the rails of a boat	expel, as if by official decree
lay with rails
travel by rail or train
separate with a railing
convey (goods etc.) by rails
provide with rails
enclose with rails