throwing stick vs spear thrower

throwing stick and spear thrower both are nouns.

Word	Noun	Adjective	Verb	Adverb
throwing stick	Yes	No	No	No
spear thrower	Yes	No	No	No

As nouns, throwing stick and spear thrower are synonyms defined as:

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

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

throwing stick (noun)	spear thrower (noun)
a curved piece of wood; when properly thrown will return to thrower	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