graph vs plot

graph and plot both are nouns.

Word	Noun	Adjective	Verb	Adverb
graph	Yes	No	Yes	No
plot	Yes	No	Yes	No

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

As verbs, plot is a hypernym of graph; that is, plot is a word with a broader meaning than graph:

graph: plot upon a graph
plot: make a schematic or technical drawing that shows interactions among variables or how something is constructed

Other hypernyms of graph include diagram.

graph (noun)	plot (noun)
a visual representation of the relations between certain quantities, represented as points, plotted with reference to a set of axes	a secret scheme to do something (especially something underhand or illegal)
a visual display of information	the story that is told in a novel or play or movie etc.
a written symbol that is used to represent speech	a chart or graph showing the movements or progress of an object
	a small area of ground covered by specific vegetation

graph (verb)	plot (verb)
represent by means of a graph	plan secretly, usually something illegal
plot upon a graph	make a plot of
	make a schematic or technical drawing that shows interactions among variables or how something is constructed
	devise the sequence of events in (a literary work or a play, movie, or ballet)