ram vs chock up

ram is a noun but chock up is not a noun.

Word	Noun	Adjective	Verb	Adverb
ram	Yes	No	Yes	No
chock up	No	No	Yes	No

As verbs, ram and chock up are synonyms defined as:

Other synonyms of ram include cram, jam, jampack, wad.

ram (noun)	chock up (noun)
uncastrated adult male sheep
a tool for driving or forcing something by impact

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