photoengraving vs halftone

photoengraving and halftone both are nouns.

Word	Noun	Adjective	Verb	Adverb
photoengraving	Yes	No	No	No
halftone	Yes	No	No	No

As nouns, photoengraving and halftone are synonyms defined as:

photoengraving and halftone: an engraving used to reproduce an illustration

Other synonyms of photoengraving include halftone engraving.

photoengraving (noun)	halftone (noun)
an engraving used to reproduce an illustration	an engraving used to reproduce an illustration
	a print obtained from photoengraving