bowl over vs overturn

bowl over is not a noun while overturn is a noun.

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

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

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

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

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

bowl over (verb)	overturn (verb)
overcome with amazement	change radically
cause to overturn from an upright or normal position	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