load up vs surcharge

load up is not a noun while surcharge is a noun.

Word	Noun	Adjective	Verb	Adverb
load up	No	No	Yes	No
surcharge	Yes	No	Yes	No

As verbs, surcharge is a hyponym of load up; that is, surcharge is a word with a more specific, narrower meaning than load up:

Other hyponyms of load up include load down, pack, bomb up, overcharge, overload, reload, stack.

load up (noun)	surcharge (noun)
	an additional charge (as for items previously omitted or as a penalty for failure to exercise common caution or common skill)

load up (verb)	surcharge (verb)
fill or place a load on	show an omission in (an account) for which credit ought to have been given
	fill to an excessive degree
	place too much a load on
	print a new denomination on a stamp or a banknote
	fill to capacity with people
	rip off; ask an unreasonable price
	charge an extra fee, as for a special service