line of heart vs love line

line of heart and love line both are nouns.

Word	Noun	Adjective	Verb	Adverb
line of heart	Yes	No	No	No
love line	Yes	No	No	No

As nouns, line of heart and love line are synonyms defined as:

line of heart and love line: a crease on the palm; palmists say it indicates your emotional nature

Other synonyms of line of heart include heart line, mensal line.

line of heart (noun)	love line (noun)
a crease on the palm; palmists say it indicates your emotional nature	a crease on the palm; palmists say it indicates your emotional nature