Abstract nouns are things that can’t be physically sensed, while concrete nouns can be physically sensed. For example, ‘comment’ is a concrete noun so you hear a verbal comment, or see a written comment. The word Hope is on the other hand, you can’t see or hear physically so one word is abstract. The ‘promise’ is usually a concrete noun because you can hear it or see it. The ‘truth’ or a ‘lie’, on the other side, is generally a concept that isn’t material or is thus abstract; however, if someone writes a statement for as ‘truth’ or ‘lie’, then that use makes the noun concrete. ‘Desire’, ‘hate’, or ‘love’ can be examples of abstract nouns but

not explicitly nouns.