plot vs scheme

plot and scheme both are nouns.

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

As nouns, scheme is a hypernym of plot; that is, scheme is a word with a broader meaning than plot:

plot: a secret scheme to do something (especially something underhand or illegal)
scheme: an elaborate and systematic plan of action

Other hypernyms of plot include strategy.

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

Other hyponyms of plot include cabal, complot, conjure, conspire, machinate, counterplot, connive, intrigue.

plot (noun)	scheme (noun)
a secret scheme to do something (especially something underhand or illegal)	an elaborate and systematic plan of action
the story that is told in a novel or play or movie etc.	an internal representation of the world; an organization of concepts and actions that can be revised by new information about the world
a chart or graph showing the movements or progress of an object	a schematic or preliminary plan
a small area of ground covered by specific vegetation	a statement that evades the question by cleverness or trickery
	a group of independent but interrelated elements comprising a unified whole

plot (verb)	scheme (verb)
plan secretly, usually something illegal	form intrigues (for) in an underhand manner
make a plot of	devise a system or form a scheme for
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)