flash-frozen vs quick-frozen

flash-frozen and quick-frozen both are adjectives.

Word	Noun	Adjective	Verb	Adverb
flash-frozen	No	Yes	No	No
quick-frozen	No	Yes	No	No

As adjectives, flash-frozen and quick-frozen are synonyms defined as:

flash-frozen and quick-frozen: (used of foods) preserved by freezing sufficiently rapidly to retain flavor and nutritional value

Other synonyms of flash-frozen include frozen.

flash-frozen (adjective)	quick-frozen (adjective)
(used of foods) preserved by freezing sufficiently rapidly to retain flavor and nutritional value	(used of foods) preserved by freezing sufficiently rapidly to retain flavor and nutritional value