viewgraph vs transparency

viewgraph and transparency both are nouns.

Word	Noun	Adjective	Verb	Adverb
viewgraph	Yes	No	No	No
transparency	Yes	No	No	No

As nouns, transparency is a hypernym of viewgraph; that is, transparency is a word with a broader meaning than viewgraph:

viewgraph: a transparency for use with an overhead projector
transparency: picture consisting of a positive photograph or drawing on a transparent base; viewed with a projector

Other hypernyms of viewgraph include foil.

viewgraph (noun)	transparency (noun)
a transparency for use with an overhead projector	picture consisting of a positive photograph or drawing on a transparent base; viewed with a projector
	the quality of being clear and transparent
	permitting the free passage of electromagnetic radiation