Yes, the noun 'world' is a countable noun, the plural form is worlds.
The noun 'hill' is a countable noun. The plural form is 'hills'.
Yes, the word 'sea' is a countable noun. The noun 'sea' is a word for a body of water, there are many seas in the world.
Shark is 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 'desert' is a countable noun; the plural form is deserts.
The noun analysis is a countable noun; the plural form is analyses.
The noun utensil is a countable noun; one utensil, many utensils.