engraving vs aquatint

engraving and aquatint both are nouns.

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

As nouns, aquatint is a hyponym of engraving; that is, aquatint is a word with a more specific, narrower meaning than engraving:

engraving: making engraved or etched plates and printing designs from them
aquatint: a method of etching that imitates the broad washes of a water color

Other hyponyms of engraving include steel engraving, plaster printing.

engraving (noun)	aquatint (noun)
making engraved or etched plates and printing designs from them	a method of etching that imitates the broad washes of a water color
a block or plate or other hard surface that has been engraved	an etching made by a process that makes it resemble a water color
a print made from an engraving

engraving (verb)	aquatint (verb)
	etch in aquatint