line engraving vs engraving

line engraving and engraving both are nouns.

Word	Noun	Adjective	Verb	Adverb
line engraving	Yes	No	No	No
engraving	Yes	No	No	No

As nouns, engraving is a hypernym of line engraving; that is, engraving is a word with a broader meaning than line engraving:

line engraving: engraving consisting of a block that has been etched or engraved
engraving: a block or plate or other hard surface that has been engraved

As nouns, engraving is a hypernym of line engraving; that is, engraving is a word with a broader meaning than line engraving:

line engraving (noun)	engraving (noun)
engraving consisting of a block that has been etched or engraved	making engraved or etched plates and printing designs from them
a print obtained from a line drawing	a block or plate or other hard surface that has been engraved
	a print made from an engraving