load vs fill up

load is a noun but fill up is not a noun.

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

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

Other hypernyms of load include fill, make full.

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

Other hypernyms of load include fill, make full.

load (noun)	fill up (noun)
weight to be borne or conveyed
the front part of a guided missile or rocket or torpedo that carries the nuclear or explosive charge or the chemical or biological agents
goods carried by a large vehicle
electrical device to which electrical power is delivered
an onerous or difficult concern
a deposit of valuable ore occurring within definite boundaries separating it from surrounding rocks
the power output of a generator or power plant
a quantity that can be processed or transported at one time
an amount of alcohol sufficient to intoxicate

load (verb)	fill up (verb)
corrupt, debase, or make impure by adding a foreign or inferior substance; often by replacing valuable ingredients with inferior ones	make full, also in a metaphorical sense
fill or place a load on	become full
provide (a device) with something necessary	eat until one is sated
put (something) on a structure or conveyance	fill or stop up
transfer from a storage device to a computer's memory