deathly vs death

deathly is not a noun while death is a noun.

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

deathly (noun)	death (noun)
	the act of killing
	the event of dying or departure from life
	the permanent end of all life functions in an organism or part of an organism
	the absence of life or state of being dead
	a final state
	the time when something ends
	the time at which life ends; continuing until dead

deathly (adjective)	death (adjective)
having the physical appearance of death
causing or capable of causing death

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