line of heart vs heart line

line of heart and heart line both are nouns.

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

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

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

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

line of heart (noun)	heart 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