calcedony vs plasma

calcedony and plasma both are nouns.

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

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

calcedony: a milky or greyish translucent to transparent quartz
plasma: a green slightly translucent variety of chalcedony used as a gemstone

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

calcedony (noun)	plasma (noun)
a milky or greyish translucent to transparent quartz	the colorless watery fluid of the blood and lymph that contains no cells, but in which the blood cells (erythrocytes, leukocytes, and thrombocytes) are suspended
	(physical chemistry) a fourth state of matter distinct from solid or liquid or gas and present in stars and fusion reactors; a gas becomes a plasma when it is heated until the atoms lose all their electrons, leaving a highly electrified collection of nuclei and free electrons
	a green slightly translucent variety of chalcedony used as a gemstone