override vs overthrow

override and overthrow both are nouns.

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

As verbs, override and overthrow are synonyms defined as:

Other synonyms of override include overrule, overturn, reverse.

override (noun)	overthrow (noun)
the act of nullifying; making null and void; counteracting or overriding the effect or force of something	the termination of a ruler or institution (especially by force)
a manually operated device to correct the operation of an automatic device	the act of disturbing the mind or body

override (verb)	overthrow (verb)
rule against	rule against
ride (a horse) too hard	cause the downfall of; of rulers
counteract the normal operation of (an automatic gear shift in a vehicle)
prevail over