resume vs sum up

resume is a noun but sum up is not a noun.

Word	Noun	Adjective	Verb	Adverb
resume	Yes	No	Yes	No
sum up	No	No	Yes	No

As verbs, resume and sum up are synonyms defined as:

Other synonyms of resume include summarise, summarize.

resume (noun)	sum up (noun)
short descriptive summary (of events)
a summary of your academic and work history

resume (verb)	sum up (verb)
take up or begin anew	give a summary (of)
return to a previous location or condition	determine the sum of
give a summary (of)	be a summary of
assume anew