line of life vs life line

line of life and life line both are nouns.

Word	Noun	Adjective	Verb	Adverb
line of life	Yes	No	No	No
life line	Yes	No	No	No

As nouns, line of life and life line are synonyms defined as:

line of life and life line: a crease on the palm; its length is said by palmists to indicate how long you will live

Other synonyms of line of life include lifeline.

line of life (noun)	life line (noun)
a crease on the palm; its length is said by palmists to indicate how long you will live	a crease on the palm; its length is said by palmists to indicate how long you will live