throwing board vs dart thrower

throwing board and dart thrower both are nouns.

Word	Noun	Adjective	Verb	Adverb
throwing board	Yes	No	No	No
dart thrower	Yes	No	No	No

As nouns, throwing board and dart thrower are synonyms defined as:

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

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

throwing board (noun)	dart 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