spoon food vs soft diet

spoon food and soft diet both are nouns.

Word	Noun	Adjective	Verb	Adverb
spoon food	Yes	No	No	No
soft diet	Yes	No	No	No

As nouns, spoon food and soft diet are synonyms defined as:

spoon food and soft diet: a diet that does not require chewing; advised for those with intestinal disorders

Other synonyms of spoon food include pap.

spoon food (noun)	soft diet (noun)
a diet that does not require chewing; advised for those with intestinal disorders	a diet that does not require chewing; advised for those with intestinal disorders