Are abstract nouns and mass nouns are the same?

Abstract nouns and mass nouns can be the same, but that is coincidental since abstract nouns and mass nouns are two different kinds of nouns.

Abstract nouns are Word for things that can't be experienced by the five senses, they can't be seen, heard, smelled, tasted, or touched; they are things that can only be known, understood, learned, believed, or felt emotionally. Some examples are attitude, belief, charm, danger, emotions,

A mass (uncountable) noun is a Word for something that you cannot count, such as substances, concepts, and gerunds. Some examples are rice, sand, information, advice, electricity, swimming.

Some mass nouns for substances reserve the use of the plural form for 'types of' or kinds of' only; for example:

• the selection of teas are black, green, or jasmine
• a menu of rices including white, wild, and basmatti
• the paints needed are flat for the walls and enamel for the trim

Some abstract nouns can be singular or plural; for example:

• idea, ideas
• feeling, feelings
• war, wars

Some abstract nouns are also mass nouns, expressed in units of or amounts, for example:

• some advice, a little advice
• a piece of news, a lot of news
• acts of courage, great courage