Yes, the gerund (verbal noun) 'painting' is a countable noun. The plural form is paintings. Examples:
The gerund painting is a countable noun, as in "There are 12 paintings in this room."
The noun 'hill' is a countable noun. The plural form is 'hills'.
Shark is a countable noun.
No, "np" is not a countable noun.
Prawn - prawns is the plural - is a countable noun
Transport is both countable and uncountable as a noun.
Yes, property is a countable noun.
The noun 'animal' is a countable noun. The plural form is animals.
Yes, the noun 'marriage' is a countable noun. The plural noun is marriages.
The noun meeting is a countable noun; for example: We have a meeting this afternoon. We've had two meetings already this week.
The noun analysis is a countable noun; the plural form is analyses.
The noun 'desert' is a countable noun; the plural form is deserts.