plank over vs plank

plank over is not a noun while plank is a noun.

Word	Noun	Adjective	Verb	Adverb
plank over	No	No	Yes	No
plank	Yes	No	Yes	No

As verbs, plank over and plank are synonyms defined as:

plank over (noun)	plank (noun)
	an endorsed policy in the platform of a political party
	a stout length of sawn timber; made in a wide variety of sizes and used for many purposes

plank over (verb)	plank (verb)
cover with planks	cook and serve on a plank
	cover with planks
	set (something or oneself) down with or as if with a noise