load up vs fill up

load up and fill up both are verbs.

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

As verbs, fill up is a hypernym of load up; that is, fill up is a word with a broader meaning than load up:

Other hypernyms of load up include fill, make full.

load up (verb)	fill up (verb)
fill or place a load on	make full, also in a metaphorical sense
	become full
	eat until one is sated
	fill or stop up