paving stone vs cobble

paving stone and cobble both are nouns.

Word	Noun	Adjective	Verb	Adverb
paving stone	Yes	No	No	No
cobble	Yes	No	Yes	No

As nouns, cobble is a hyponym of paving stone; that is, cobble is a word with a more specific, narrower meaning than paving stone:

Other hyponyms of paving stone include cobblestone, sett, curbstone, kerbstone, flag, flagstone.

paving stone (noun)	cobble (noun)
a stone used for paving	rectangular paving stone with curved top; once used to make roads

paving stone (verb)	cobble (verb)
	repair or mend
	pave with cobblestones