"cold" is an adjective, and "water" is a noun.
Cold is an adjective in that context.
Cold is a noun and an adjective. Noun: I have a cold. Adjective: Expect cold weather.
So is an adverb in that example.
It depends. Noun: Give her a drink of water. We have a house on the water. The water is cold. Verb: Don't forget to water the flowers. Adjective: There's a hole in the water bucket. The pilot tried for a water landing.
Colder is an adjective. It's the comparative form of cold.
What part of speech is the word freely in freely enjoying the water
Cough is a verb because you can cough for example the man had to 'cough'.
Hydrophobia (the fear of water) is a noun.
The word lake is a noun. It is a stretch of water.
Cold is a noun and an adjective. Noun: I have a cold. Adjective: Expect cold weather.
In that usage, it would be an adverb.
The part of speech for this particular word is a noun.