dietician vs diet

dietician and diet both are nouns.

Word	Noun	Adjective	Verb	Adverb
dietician	Yes	No	No	No
diet	Yes	No	Yes	No

dietician (noun)	diet (noun)
a specialist in the study of diet and nutrition	the act of restricting your food intake (or your intake of particular foods)
	a prescribed selection of foods
	the usual food and drink consumed by an organism (person or animal)
	a legislative assembly in certain countries (e.g., Japan)

dietician (verb)	diet (verb)
	eat sparingly, for health reasons or to lose weight
	follow a regimen or a diet, as for health reasons