effusion vs manifestation

effusion and manifestation both are nouns.

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

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

Other hypernyms of effusion include expression, reflection, reflexion.

effusion (noun)	manifestation (noun)
flow under pressure	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
	expression without words
	a clear appearance
	an appearance in bodily form (as of a disembodied spirit)