overthrow vs overturn

overthrow and overturn both are nouns.

Word	Noun	Adjective	Verb	Adverb
overthrow	Yes	No	Yes	No
overturn	Yes	No	Yes	No

As verbs, overthrow and overturn are synonyms defined as:

Other synonyms of overthrow include override, overrule, reverse.

As verbs, overthrow and overturn are synonyms defined as:

Other synonyms of overthrow include bring down, subvert.

overthrow (noun)	overturn (noun)
the termination of a ruler or institution (especially by force)	the act of upsetting something
the act of disturbing the mind or body	an improbable and unexpected victory

overthrow (verb)	overturn (verb)
rule against	change radically
cause the downfall of; of rulers	rule against
	cancel officially
	turn from an upright or normal position
	cause to overturn from an upright or normal position
	cause the downfall of; of rulers