freeze vs unfreeze

freeze is a noun but unfreeze is not a noun.

Word	Noun	Adjective	Verb	Adverb
freeze	Yes	No	Yes	No
unfreeze	No	No	Yes	No

freeze (noun)	unfreeze (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)	unfreeze (verb)
be cold	become or cause to become soft or liquid
anesthetize by cold	make (assets) available
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