wampum vs string of beads

wampum and string of beads both are nouns.

Word	Noun	Adjective	Verb	Adverb
wampum	Yes	No	No	No
string of beads	Yes	No	No	No

As nouns, string of beads is a hypernym of wampum; that is, string of beads is a word with a broader meaning than wampum:

wampum: small cylindrical beads made from polished shells and fashioned into strings or belts; used by certain Native American peoples as jewelry or currency
string of beads: several beads threaded together on a string

Other hypernyms of wampum include beads.

wampum (noun)	string of beads (noun)
small cylindrical beads made from polished shells and fashioned into strings or belts; used by certain Native American peoples as jewelry or currency	several beads threaded together on a string
informal terms for money