loadstone vs permanent magnet

loadstone and permanent magnet both are nouns.

Word	Noun	Adjective	Verb	Adverb
loadstone	Yes	No	No	No
permanent magnet	Yes	No	No	No

As nouns, permanent magnet is a hypernym of loadstone; that is, permanent magnet is a word with a broader meaning than loadstone:

loadstone: a permanent magnet consisting of magnetite that possess polarity and has the power to attract as well as to be attracted magnetically
permanent magnet: a magnet that retains its magnetism after being removed from a magnetic field

Other hypernyms of loadstone include static magnet.

loadstone (noun)	permanent magnet (noun)
a permanent magnet consisting of magnetite that possess polarity and has the power to attract as well as to be attracted magnetically	a magnet that retains its magnetism after being removed from a magnetic field