last-ditch vs ultimate

last-ditch is not a noun while ultimate is a noun.

Word	Noun	Adjective	Verb	Adverb
last-ditch	No	Yes	No	No
ultimate	Yes	Yes	No	No

last-ditch (noun)	ultimate (noun)
	the finest or most superior quality of its kind

last-ditch (adjective)	ultimate (adjective)
of something done as a final recourse (especially to prevent a crisis or disaster)	furthest or highest in degree or order; utmost or extreme
	being the last or concluding element of a series