plethora · noun /ˈpleθ.ə.rə/
a plethora of sth
C2 a large number of something
Dictionary example:
There is a confusing plethora of pension plans.
Learner example:
There is a plethora of diets proposed by nutritonists and even if the ingredients happen to be widely diversified, every single one recom[m]ends fruit and vegetables as the most vital strengtheners of [the] human immune system. (Certificate of Proficiency in English; C2; Serbian)