railway locomotive vs buffer

railway locomotive and buffer both are nouns.

Word	Noun	Adjective	Verb	Adverb
railway locomotive	Yes	No	No	No
buffer	Yes	No	Yes	No

railway locomotive (noun)	buffer (noun)
a wheeled vehicle consisting of a self-propelled engine that is used to draw trains along railway tracks	a cushion-like device that reduces shock due to an impact
	a power tool used to buff surfaces
	an inclined metal frame at the front of a locomotive to clear the track
	(computer science) a part of RAM used for temporary storage of data that is waiting to be sent to a device; used to compensate for differences in the rate of flow of data between components of a computer system
	an implement consisting of soft material mounted on a block; used for polishing (as in manicuring)
	a neutral zone between two rival powers that is created in order to diminish the danger of conflict
	(chemistry) an ionic compound that resists changes in its pH

railway locomotive (verb)	buffer (verb)
	add a buffer (a solution)
	protect from impact