irrecoverable vs lost

irrecoverable is not a noun while lost is a noun.

Word	Noun	Adjective	Verb	Adverb
irrecoverable	No	Yes	No	No
lost	Yes	Yes	No	No

irrecoverable (noun)	lost (noun)
	people who are destined to die soon

irrecoverable (adjective)	lost (adjective)
incapable of being recovered or regained	no longer in your possession or control; unable to be found or recovered
	spiritually or physically doomed or destroyed
	not gained or won
	unable to function; without help
	not caught with the senses or the mind
	perplexed by many conflicting situations or statements; filled with bewilderment
	deeply absorbed in thought
	having lost your bearings; confused as to time or place or personal identity
	cannot be recovered or regained