'A great deal of' is used to determine -

A lot of/ lots of/ plenty of/ a great deal of দ্বারা Countable এবং Uncountable দুই ধরনের Noun কেই Determine করা হয়।
যেমন -
- A lot of students were present in the class.
- There is a lot of water in the pond.

A mass noun (or non-countable noun or noncount noun as it's also known) is a noun without a plural form. A mass noun is one that cannot be counted.