Classifications of consonants

ABSTRACT NOUNS AND CONCRETE NOUNS.
What are abstract nouns? Nouns in general represent things (including people, places, objects, and ideas). But some things aren’t actually things! Ideas, emotions, personality traits, and philosophical concepts don’t exist in the physical world—you can’t sense them or interact with them—so we call them abstract nouns to differentiate them from concrete nouns. 
Abstract nouns vs. concrete nouns. We dive deep into abstract nouns vs. concrete nouns here, but there’s a quick and easy way to tell them apart. If you can see, hear, taste, smell, or touch it, then it’s a concrete noun. If you can’t, then it’s an abstract noun. Consider the difference between anger, an abstract noun, and chair, a concrete noun. You can touch a chair and see a chair, but you can’t touch or see anger itself. (Even though you can use your five senses to perceive the signs of anger, such as seeing a red face or hearing a gruff tone.) By default, proper nouns are never abstract nouns. Proper nouns like the Empire State Building, Kathmandu, or Mister Rogers represent things that are specific and tangible. However, this can get confusing if a philosophical idea is derived from a proper noun. For example, Karl Marx is a proper noun, but Marxism is an abstract noun, even though it’s still capitalized. 
Examples of abstract nouns
People: man, women, people, friends, enemy, baker, actress, Jackie Chan, Michelle Obama, Batman, Joan of Arc, Santa Claus
Places: city, neighborhoods, beach, countries, Madrid, Peru, Asia, Saturn
Things: chair, books, grass, trees, food, water, fire, oxygen, electron, virus, brain, elbows, furniture, iPhone, Pop-Tarts, Bank of America, Fortnite, TikTok, dictionary, thesaurus
As we’ve said, abstract nouns can be hard to describe because they elude the senses. Sometimes it’s better to see examples to understand. (Some of these can also double as verbs, especially the emotions, so pay attention to how they’re used in the sentence.)
Figure 1

Ideas life death humor independence communication information honor trust pain pleasure	Emotions love hatred happiness sadness fear anguish ecstasy