line engraving vs line block

line engraving and line block both are nouns.

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

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

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

Other synonyms of line engraving include linecut.

line engraving (noun)	line block (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