chalk line vs snapline

chalk line and snapline both are nouns.

Word	Noun	Adjective	Verb	Adverb
chalk line	Yes	No	No	No
snapline	Yes	No	No	No

As nouns, chalk line and snapline are synonyms defined as:

chalk line and snapline: a chalked string used in the building trades to make a straight line on a vertical surface

Other synonyms of chalk line include snap line.

chalk line (noun)	snapline (noun)
a chalked string used in the building trades to make a straight line on a vertical surface	a chalked string used in the building trades to make a straight line on a vertical surface