평생 means a "whole life" as a noun, "as long as (sb) live" as an adverb.
생활 and 삶 both means "life", but 생활 is a little bit more focussed on "daylife," but basically same.
Words that mean "life" are: 삶, 생활, 생, 생애, 일상.
Hope it helps. :)
November 19, 2017
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