overturn vs bowl over

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

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

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

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

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

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

overturn (verb)	bowl over (verb)
change radically	overcome with amazement
rule against	cause to overturn 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