string line vs balkline

string line and balkline both are nouns.

Word	Noun	Adjective	Verb	Adverb
string line	Yes	No	No	No
balkline	Yes	No	No	No

As nouns, string line and balkline are synonyms defined as:

string line and balkline: line across a billiard table behind which the cue balls are placed at the start of a game

Other synonyms of string line include baulk-line.

string line (noun)	balkline (noun)
line across a billiard table behind which the cue balls are placed at the start of a game	line across a billiard table behind which the cue balls are placed at the start of a game