morale booster vs morale builder

morale booster and morale builder both are nouns.

Word	Noun	Adjective	Verb	Adverb
morale booster	Yes	No	No	No
morale builder	Yes	No	No	No

As nouns, morale booster and morale builder are synonyms defined as:

morale booster and morale builder: anything that serves to increase morale

Other synonyms of morale booster include morale building.

morale booster (noun)	morale builder (noun)
anything that serves to increase morale	anything that serves to increase morale
	something or someone who influences by building or strengthening morale