double-dyed vs everlasting

double-dyed is not a noun while everlasting is a noun.

Word	Noun	Adjective	Verb	Adverb
double-dyed	No	Yes	No	No
everlasting	Yes	Yes	No	No

As adjectives, double-dyed and everlasting are synonyms defined as:

double-dyed and everlasting: without qualification; used informally as (often pejorative) intensifiers

double-dyed (noun)	everlasting (noun)
	any of various plants of various genera of the family Compositae having flowers that can be dried without loss of form or color

double-dyed (adjective)	everlasting (adjective)
without qualification; used informally as (often pejorative) intensifiers	continuing forever or indefinitely
	without qualification; used informally as (often pejorative) intensifiers