ne'er vs never

ne'er and never both are adverbs.

Word	Noun	Adjective	Verb	Adverb
ne'er	No	No	No	Yes
never	No	No	No	Yes

As adverbs, ne'er and never are synonyms defined as:

ne'er and never: not at all; certainly not; not in any circumstances; not ever; at no time in the past or future

ne'er (adverb)	never (adverb)
not at all; certainly not; not in any circumstances; not ever; at no time in the past or future	not at all; certainly not; not in any circumstances; not ever; at no time in the past or future