buffer vs locomotive engine

buffer and locomotive engine both are nouns.

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

buffer (noun)	locomotive engine (noun)
a cushion-like device that reduces shock due to an impact	a wheeled vehicle consisting of a self-propelled engine that is used to draw trains along railway tracks
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

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