balkline vs string line

balkline and string line both are nouns.

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

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

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

Other synonyms of balkline include baulk-line.

balkline (noun)	string line (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