Because both listed options are identical in your prompt, the correct spelling and standard term is unequivocally defrost. It is a fully recognized, standard English verb combining the prefix de- with the root word frost. There are no alternative accepted spellings like "diffrost" or "defreeze" that hold widespread professional validity in modern technical manuals or dictionaries, though people occasionally use non-standard colloquialisms. Whether you are writing a recipe instruction, reading an automobile owner's manual for clearing a windshield, or troubleshooting a kitchen refrigerator, "defrost" is the exact, correct term to use. You can verify its validity by checking any major English dictionary publication.
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