chicory vs radicchio

chicory and radicchio both are nouns.

Word	Noun	Adjective	Verb	Adverb
chicory	Yes	No	No	No
radicchio	Yes	No	No	No

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

chicory (noun)	radicchio (noun)
crisp spiky leaves with somewhat bitter taste	prized variety of chicory having globose heads of red leaves
root of the chicory plant roasted and ground to substitute for or adulterate coffee
perennial Old World herb having rayed flower heads with blue florets cultivated for its root and its heads of crisp edible leaves used in salads
the dried root of the chicory plant: used as a coffee substitute