ledger line vs leger line

ledger line and leger line both are nouns.

Word	Noun	Adjective	Verb	Adverb
ledger line	Yes	No	No	No
leger line	Yes	No	No	No

As nouns, ledger line and leger line are synonyms defined as:

ledger line and leger line: a short line; a notation for extending the range above or below the staff

ledger line (noun)	leger line (noun)
a short line; a notation for extending the range above or below the staff	a short line; a notation for extending the range above or below the staff