outburst vs manifestation

outburst and manifestation both are nouns.

Word	Noun	Adjective	Verb	Adverb
outburst	Yes	No	No	No
manifestation	Yes	No	No	No

As nouns, manifestation is a hypernym of outburst; that is, manifestation is a word with a broader meaning than outburst:

Other hypernyms of outburst include expression, reflection, reflexion.

outburst (noun)	manifestation (noun)
a sudden violent disturbance	a public display of group feelings (usually of a political nature)
an unrestrained expression of emotion	a manifest indication of the existence or presence or nature of some person or thing
a sudden intense happening	expression without words
	a clear appearance
	an appearance in bodily form (as of a disembodied spirit)