dart thrower vs spear thrower

dart thrower and spear thrower both are nouns.

Word	Noun	Adjective	Verb	Adverb
dart thrower	Yes	No	No	No
spear thrower	Yes	No	No	No

As nouns, dart thrower and spear thrower are synonyms defined as:

dart thrower and spear thrower: a device resembling a sling that is used in various primitive societies to propel a dart or spear

Other synonyms of dart thrower include throwing board, throwing stick.

dart thrower (noun)	spear thrower (noun)
a device resembling a sling that is used in various primitive societies to propel a dart or spear	a device resembling a sling that is used in various primitive societies to propel a dart or spear