livelong vs live-forever

livelong and live-forever both are nouns.

Word	Noun	Adjective	Verb	Adverb
livelong	Yes	Yes	No	No
live-forever	Yes	No	No	No

As nouns, livelong and live-forever are synonyms defined as:

livelong and live-forever: perennial northern temperate plant with toothed leaves and heads of small purplish-white flowers

Other synonyms of livelong include orpin, orpine, Sedum telephium.

livelong (noun)	live-forever (noun)
perennial northern temperate plant with toothed leaves and heads of small purplish-white flowers	perennial northern temperate plant with toothed leaves and heads of small purplish-white flowers

livelong (adjective)	live-forever (adjective)
(of time) constituting the full extent or duration