deathly vs super

deathly is not a noun while super is a noun.

Word	Noun	Adjective	Verb	Adverb
deathly	No	Yes	No	Yes
super	Yes	Yes	No	Yes

As adverbs, deathly and super are synonyms defined as:

Other synonyms of deathly include exceedingly, extremely.

deathly (noun)	super (noun)
	a caretaker for an apartment house; represents the owner as janitor and rent collector

deathly (adjective)	super (adjective)
having the physical appearance of death	including more than a specified category
causing or capable of causing death	extremely large
	of the highest quality

deathly (adverb)	super (adverb)
to a degree resembling death	to an extreme degree
to an extreme degree