paving stone vs sett

paving stone and sett both are nouns.

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

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

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

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