The plural form of 'rain', is 'rains'.
The plural form for nimbus (grey rain cloud) is nimbi.
It is singular. "The rain is falling." To be plural, the usage would be something like "the rain drops are." (rain would be an adjective)
Bridges is the plural form of bridge.
Thunder as a noun is a sound produced by lightning, so it normally has no plural form. Occurrences at two separate times or places would remain "thunder."
Yes, the word 'rains' is both a verb and a noun. The verb form is the third person, singular, present of the verb 'to rain'. The noun form is the plural form of the noun 'rain'. The plural noun, 'rains', is a word for the time period characterized by frequent or intense rain, the rainy season.
"Groceries" is the plural form of "grocery."
There is no plural form for the word, countries. This word itself is a plural.
"Beliefs" does not have a plural form, as it is already plural. Beliefs is the plural form of belief.
The plural form of "meter" is "meters."
No, "rain" is not a plural noun. It is a singular noun that refers to water falling from the sky in drops.
Singular. :)