salad days vs bloom

salad days and bloom both are nouns.

Word	Noun	Adjective	Verb	Adverb
salad days	Yes	No	No	No
bloom	Yes	No	Yes	No

As nouns, salad days and bloom are synonyms defined as:

Other synonyms of salad days include bloom of youth.

salad days (noun)	bloom (noun)
the best time of youth	a powdery deposit on a surface
	reproductive organ of angiosperm plants especially one having showy or colorful parts
	the organic process of bearing flowers
	a rosy color (especially in the cheeks) taken as a sign of good health
	the best time of youth
	the period of greatest prosperity or productivity

salad days (verb)	bloom (verb)
	produce or yield flowers