hydraulic pump vs hydraulic ram

hydraulic pump and hydraulic ram both are nouns.

Word	Noun	Adjective	Verb	Adverb
hydraulic pump	Yes	No	No	No
hydraulic ram	Yes	No	No	No

As nouns, hydraulic pump and hydraulic ram are synonyms defined as:

hydraulic pump and hydraulic ram: a water pump that uses the kinetic energy of flowing water to force a small fraction of that water to a reservoir at a higher level

hydraulic pump (noun)	hydraulic ram (noun)
a water pump that uses the kinetic energy of flowing water to force a small fraction of that water to a reservoir at a higher level	a water pump that uses the kinetic energy of flowing water to force a small fraction of that water to a reservoir at a higher level