Yes, the noun 'leather' is an uncountable noun, a word for a substance and a material noun. Leather is expressed as a piece of leather, a square foot of leather, a length of leather, etc.
The plural form for some uncountable nouns is reserved for 'kinds of' or 'types of', for example:
The leathers in this garment are calf trimmed with split suede.
The noun 'hill' is a countable noun. The plural form is 'hills'.
Prawn - prawns is the plural - is a countable noun
Transport is both countable and uncountable as a noun.
The noun 'animal' is a countable noun. The plural form is animals.
The noun 'desert' is a countable noun; the plural form is deserts.
The noun 'hill' is a countable noun. The plural form is 'hills'.
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.
countable