bloom vs salad days

bloom and salad days both are nouns.

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

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

Other synonyms of bloom include bloom of youth.

bloom (noun)	salad days (noun)
a powdery deposit on a surface	the best time of youth
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

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