cithern vs gittern

cithern and gittern both are nouns.

Word	Noun	Adjective	Verb	Adverb
cithern	Yes	No	No	No
gittern	Yes	No	No	No

As nouns, cithern and gittern are synonyms defined as:

cithern and gittern: a 16th century musical instrument resembling a guitar with a pear-shaped soundbox and wire strings

Other synonyms of cithern include cither, citole, cittern.

cithern (noun)	gittern (noun)
a 16th century musical instrument resembling a guitar with a pear-shaped soundbox and wire strings	a 16th century musical instrument resembling a guitar with a pear-shaped soundbox and wire strings