deluge vs fill up

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

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

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

Other hypernyms of deluge include fill, make full.

deluge (noun)	fill up (noun)
a heavy rain
the rising of a body of water and its overflowing onto normally dry land
an overwhelming number or amount

deluge (verb)	fill up (verb)
fill or cover completely, usually with water	make full, also in a metaphorical sense
charge someone with too many tasks	become full
fill quickly beyond capacity; as with a liquid	eat until one is sated
	fill or stop up