jacks vs knucklebones

jacks and knucklebones both are nouns.

Word	Noun	Adjective	Verb	Adverb
jacks	Yes	No	No	No
knucklebones	Yes	No	No	No

As nouns, jacks and knucklebones are synonyms defined as:

jacks and knucklebones: a game in which jackstones are thrown and picked up in various groups between bounces of a small rubber ball

Other synonyms of jacks include jackstones.

jacks (noun)	knucklebones (noun)
a game in which jackstones are thrown and picked up in various groups between bounces of a small rubber ball	a game in which jackstones are thrown and picked up in various groups between bounces of a small rubber ball