freeze-drying vs freezing

freeze-drying and freezing both are nouns.

Word	Noun	Adjective	Verb	Adverb
freeze-drying	Yes	No	No	No
freezing	Yes	No	No	No

As nouns, freezing is a hypernym of freeze-drying; that is, freezing is a word with a broader meaning than freeze-drying:

freeze-drying: a method of drying food or blood plasma or pharmaceuticals or tissue without destroying their physical structure; material is frozen and then warmed in a vacuum so that the ice sublimes
freezing: the withdrawal of heat to change something from a liquid to a solid

Other hypernyms of freeze-drying include dehydration, desiccation, drying up, evaporation, freeze.

freeze-drying (noun)	freezing (noun)
a method of drying food or blood plasma or pharmaceuticals or tissue without destroying their physical structure; material is frozen and then warmed in a vacuum so that the ice sublimes	the withdrawal of heat to change something from a liquid to a solid