next vs incoming

next is not a noun while incoming is a noun.

Word	Noun	Adjective	Verb	Adverb
next	No	Yes	No	Yes
incoming	Yes	Yes	No	No

next (noun)	incoming (noun)
	the act of entering

next (adjective)	incoming (adjective)
nearest in space or position; immediately adjoining without intervening space	arriving at a place or position
(of elected officers) elected but not yet serving	entering upon a position of office vacated by another
immediately following in time or order
(of a day of the week) nearest (or nearest but one) after the present moment

next (adverb)	incoming (adverb)
at the time or occasion immediately following