psaltery vs stringed instrument

psaltery and stringed instrument both are nouns.

Word	Noun	Adjective	Verb	Adverb
psaltery	Yes	No	No	No
stringed instrument	Yes	No	No	No

As nouns, stringed instrument is a hypernym of psaltery; that is, stringed instrument is a word with a broader meaning than psaltery:

psaltery: an ancient stringed instrument similar to the lyre or zither but having a trapezoidal sounding board under the strings
stringed instrument: a musical instrument in which taut strings provide the source of sound

psaltery (noun)	stringed instrument (noun)
an ancient stringed instrument similar to the lyre or zither but having a trapezoidal sounding board under the strings	a musical instrument in which taut strings provide the source of sound