No, it is not. It is a noun meaning an abundance, or overabundance (excessive in number).
Plethora is singular and the plural form is plethoras
There was a plethora of food on the table at Thanksgiving.
Plethora is a noun.
The noun plethora (a plethora) uses singular verb forms.The word plethora is an uncountable (mass) noun, a type of aggregate noun that refers to an unspecified but large number of elements, e.g. a plethora of choices.
Plethora is singular and the plural form is plethoras.
well that word is a adjective, so it depends.....
It is neither an adjective nor an adverb. "Plethora" is a noun. Use it like you might use the nouns "abundance" "quantity" or "excess", when what you want to convey is "huge amount" or "overabundance". I don't think it is often pluralized; have never seen that, anyway. Also rare would be its adjective form "plethoric", leading to a stretch to make the adverb "plethorically". Good for "plethora" for being one of those words that has very very few relatives in the language!
Superabundant, overstock, plethora, oversupply (when surplus is a noun) Excess, superfluent, leftover (when surplus is an adjective)
"Plethora" is a singular noun, so you say "is a plethora."
Plethora is singular and the plural form is plethoras
(Plethora means an abundant excess as a bountiful excesss such as riches.)"The Thanksgiving feast was a plethora of favorite foods of the family.""There was a plethora of costumes to choose from for the masquerade.""From the plethora of possible names for the project, he chose the most apt."
"Is", since plethora is in singular form
There was a plethora of food on the table at Thanksgiving.
Plethora is a noun.
The noun plethora (a plethora) uses singular verb forms.The word plethora is an uncountable (mass) noun, a type of aggregate noun that refers to an unspecified but large number of elements, e.g. a plethora of choices.
Plethora is singular and the plural form is plethoras.
The grammatically correct phrase is "for myriad reasons." The word "myriad" is an adjective derived from the Greek and literally means 10,000. Its current definition is "countless" or "innumerable. The closest synonym is the adjective "manifold." In order, to determine whether any use of the term myriad is grammatically correct, replace it with the word "countless," "innumerable" or "10,000." No reasonable person would believe it to be grammatically correct to say or to write that they did something "for a countless of reasons" or "for an innumerable of reasons" or "for a 10,000 of reasons." Thus, it is not grammatically correct to say or to write that they did something "for a myriad of reasons." Therefore, the grammatically correct phrase is "for myriad reasons." In contrast, the words "bunch" and "plethora" are nouns. Thus, for these words, the grammatically proper phrases would be "for a bunch of reasons" or "for a plethora of reasons."