overturn vs tump over

overturn is a noun but tump over is not a noun.

Word	Noun	Adjective	Verb	Adverb
overturn	Yes	No	Yes	No
tump over	No	No	Yes	No

As verbs, overturn and tump over are synonyms defined as:

Other synonyms of overturn include tip over, turn over.

As verbs, overturn and tump over are synonyms defined as:

overturn and tump over: cause to overturn from an upright or normal position

Other synonyms of overturn include bowl over, knock over, tip over, turn over, upset.

overturn (noun)	tump over (noun)
the act of upsetting something
an improbable and unexpected victory

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