change over vs float

change over is not a noun while float is a noun.

Word	Noun	Adjective	Verb	Adverb
change over	No	No	Yes	No
float	Yes	No	Yes	No

As verbs, float is a hyponym of change over; that is, float is a word with a more specific, narrower meaning than change over:

Other hyponyms of change over include transduce, metricate, metricise, metricize, metrify, decimalise, decimalize.

change over (noun)	float (noun)
	an air-filled sac near the spinal column in many fishes that helps maintain buoyancy
	something that floats on the surface of water
	a hand tool with a flat face used for smoothing and finishing the surface of plaster or cement or stucco
	an elaborate display mounted on a platform carried by a truck (or pulled by a truck) in a procession or parade
	a drink with ice cream floating in it
	the number of shares outstanding and available for trading by the public
	the time interval between the deposit of a check in a bank and its payment

change over (verb)	float (verb)
make a shift in or exchange of	convert from a fixed point notation to a floating point notation
change from one system to another or to a new plan or policy	allow (currencies) to fluctuate
	make the surface of level or smooth
	put into the water
	be in motion due to some air or water current
	be afloat either on or below a liquid surface and not sink to the bottom
	set afloat
	move lightly, as if suspended
	circulate or discuss tentatively; test the waters with