glyptic art vs intaglio

glyptic art and intaglio both are nouns.

Word	Noun	Adjective	Verb	Adverb
glyptic art	Yes	No	No	No
intaglio	Yes	No	No	No

As nouns, intaglio is a hyponym of glyptic art; that is, intaglio is a word with a more specific, narrower meaning than glyptic art:

glyptic art: carvings or engravings (especially on precious stones)
intaglio: glyptic art consisting of a sunken or depressed engraving or carving on a stone or gem (as opposed to cameo)

Other hyponyms of glyptic art include anaglyph, glyph, glyptics, lithoglyptics, diaglyph.

glyptic art (noun)	intaglio (noun)
carvings or engravings (especially on precious stones)	glyptic art consisting of a sunken or depressed engraving or carving on a stone or gem (as opposed to cameo)
	a printing process that uses an etched or engraved plate; the plate is smeared with ink and wiped clean, then the ink left in the recesses makes the print