Yes it is.
No, it is not a proper noun so it does not need to be always capitalized
The noun 'nation' is a common noun, a general word for a country that has its own land and government.The noun 'nation' is an abstract noun; a word for an aggregate group of people that are linked by ancestry, history, or culture.The noun 'nation' is a concrete noun as a word for a country.
The verb form of the word "nation" is "nationalize."
No, except at the beginning of a sentence because it is n ot a proper n ou n.
nation
Only if it is the first word in a sentence or a proper name, e.g. a company named Nationwide.
Ghana, Benin , Gabon, and Niger
NATION
"la nation"
Nation
nation
The base word of "national" is "nation."