line of heart vs mensal line

line of heart and mensal line both are nouns.

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

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

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

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

line of heart (noun)	mensal 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