morale builder vs encouragement

morale builder and encouragement both are nouns.

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

As nouns, encouragement is a hypernym of morale builder; that is, encouragement is a word with a broader meaning than morale builder:

Other hypernyms of morale builder include boost.

morale builder (noun)	encouragement (noun)
anything that serves to increase morale	the act of giving hope or support to someone
something or someone who influences by building or strengthening morale	the expression of approval and support
	the feeling of being encouraged