life line vs line of life

life line and line of life both are nouns.

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

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

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

Other synonyms of life line include lifeline.

life line (noun)	line of life (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