line block vs line engraving

line block and line engraving both are nouns.

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

As nouns, line block and line engraving are synonyms defined as:

line block and line engraving: engraving consisting of a block that has been etched or engraved

Other synonyms of line block include linecut.

line block (noun)	line engraving (noun)
engraving consisting of a block that has been etched or engraved	engraving consisting of a block that has been etched or engraved
	a print obtained from a line drawing