dart thrower vs throwing board

dart thrower and throwing board both are nouns.

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

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

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

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

dart thrower (noun)	throwing board (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