ram vs rammer

ram and rammer both are nouns.

Word	Noun	Adjective	Verb	Adverb
ram	Yes	No	Yes	No
rammer	Yes	No	No	No

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

Other hyponyms of ram include battering ram.

ram (noun)	rammer (noun)
uncastrated adult male sheep	a tool for driving something with force
a tool for driving or forcing something by impact

ram (verb)	rammer (verb)
force into or from an action or state, either physically or metaphorically
undergo damage or destruction on impact
strike or drive against with a heavy impact
crowd or pack to capacity