embarrassment vs plethora

embarrassment and plethora both are nouns.

Word	Noun	Adjective	Verb	Adverb
embarrassment	Yes	No	No	No
plethora	Yes	No	No	No

As nouns, embarrassment and plethora are synonyms defined as:

Other synonyms of embarrassment include overplus, superfluity.

embarrassment (noun)	plethora (noun)
extreme excess	extreme excess
some event that causes someone to be embarrassed
the shame you feel when your inadequacy or guilt is made public
the state of being embarrassed (usually by some financial inadequacy)