Bus is a common noun, countable noun, and concrete noun.
A concrete noun is the name of something or someone that we experience through our senses; sight, hearing, smell, touch or taste. Most nouns are concrete nouns. The opposite of a concrete noun is an abstract noun. Cats, dogs, tables, chairs, buses, etc are all concrete nouns.
A common noun is the general, non-specific term for a person, place, thing, or idea. Usually, common nouns are not capitalized unless they begin a sentence. Whereas, countable nouns refer to things that can be counted. They have singular and plural forms.
Hence, bus is a common noun, countable noun, and concrete noun.
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