freeze vs ice over

freeze is a noun but ice over is not a noun.

Word	Noun	Adjective	Verb	Adverb
freeze	Yes	No	Yes	No
ice over	No	No	Yes	No

freeze (noun)	ice over (noun)
an interruption or temporary suspension of progress or movement
fixing (of prices or wages etc) at a particular level
weather cold enough to cause freezing
the withdrawal of heat to change something from a liquid to a solid

freeze (verb)	ice over (verb)
be cold	become covered with a layer of ice; of a surface such as a window
anesthetize by cold
suddenly behave coldly and formally
change to ice
stop a process or a habit by imposing a freeze on it
cause to freeze
prohibit the conversion or use of (assets)
change from a liquid to a solid when cold
stop moving or become immobilized
be very cold, below the freezing point