calcedony vs bloodstone

calcedony and bloodstone both are nouns.

Word	Noun	Adjective	Verb	Adverb
calcedony	Yes	No	No	No
bloodstone	Yes	No	No	No

As nouns, bloodstone is a hyponym of calcedony; that is, bloodstone is a word with a more specific, narrower meaning than calcedony:

Other hyponyms of calcedony include agate, heliotrope, carnelian, cornelian, chrysoprase, onyx, plasma, sard, sardine, sardius.

calcedony (noun)	bloodstone (noun)
a milky or greyish translucent to transparent quartz	green chalcedony with red spots that resemble blood