Using Are vs Is with Plethora

I have this part of a sentence for a college essay I am writing:

Penn’s plethora of student-run groups are a well-suited outlet to continue my extracurriculars.

Do I use are or is after groups? When speaking it, it sounds like “are” is correct. However, grammarly suggests otherwise. I understand that plethora is non-plural, but does the student-run groups after change the subject?

Sorry, I am pretty bad with this grammar stuff, anything helps!

Answer

A dictionary perusal reveals plethora is an uncountable or singular noun: a noun that has no plural.

Thus:

Penn’s plethora of student-run groups is a well-suited outlet to
continue my extracurriculars.

is correct. Plethora is the noun. Prepositional is “of student run groups”.

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