die vs die off

die is a noun but die off is not a noun.

Word	Noun	Adjective	Verb	Adverb
die	Yes	No	Yes	No
die off	No	No	Yes	No

die (noun)	die off (noun)
a small cube with 1 to 6 spots on the six faces; used in gambling to generate random numbers
a device used for shaping metal
a cutting tool that is fitted into a diestock and used for cutting male (external) screw threads on screws or bolts or pipes or rods

die (verb)	die off (verb)
pass from physical life and lose all bodily attributes and functions necessary to sustain life	become extinct
disappear or come to an end
suffer spiritual death; be damned (in the religious sense)
stop operating or functioning
lose sparkle or bouquet
to be on base at the end of an inning, of a player
cut or shape with a die
be brought to or as if to the point of death by an intense emotion such as embarrassment, amusement, or shame
languish as with love or desire
feel indifferent towards
suffer or face the pain of death