The difference between Category and Class
When used as nouns, category means a group, often named or numbered, to which items are assigned based on similarity or defined criteria, whereas class means a group, collection, category or set sharing characteristics or attributes.
Class is also verb with the meaning: to assign to a class.
Class is also adjective with the meaning: great.
check bellow for the other definitions of Category and Class
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Category as a noun:
A group, often named or numbered, to which items are assigned based on similarity or defined criteria.
Examples:
"This steep and dangerous climb belongs to the most difficult category."
"I wouldn't put this book in the same category as the author's first novel."
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Category as a noun (mathematics):
A collection of objects, together with a transitively closed collection of composable arrows between them, such that every object has an identity arrow, and such that arrow composition is associative.
Examples:
"One well-known category has sets as objects and functions as arrows."
"Just as a monoid consists of an underlying set with a binary operation "on top of it" which is closed, associative and with an identity, a [[category]] consists of an underlying digraph with an arrow composition operation "on top of it" which is transitively closed, associative, and with an identity at each object. In fact, a [[category]]'s composition operation, when restricted to a single one of its objects, turns that object's set of arrows (which would all be loops) into a monoid."
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Class as a noun (countable):
A group, collection, category or set sharing characteristics or attributes.
Examples:
"The new Ford Fiesta is set to be best in the 'small family' class."
"That is one class-A heifer you got there, sonny."
"Often used to imply membership of a large class."
"This word has a whole class of metaphoric extensions."
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Class as a noun (sociology, countable):
A social grouping, based on job, wealth, etc. In Britain, society is commonly split into three main classes; upper class, middle class and working class.
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Class as a noun (uncountable):
The division of society into classes.
Examples:
"Jane Austen's works deal with class in 18th-century England."
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Class as a noun (uncountable):
Admirable behavior; elegance.
Examples:
"Apologizing for losing your temper, even though you were badly provoked, showed real class."
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Class as a noun (education, countable, and, uncountable):
A group of students in a regularly scheduled meeting with a teacher.
Examples:
"The class was noisy, but the teacher was able to get their attention with a story."
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Class as a noun:
A series of classes covering a single subject.
Examples:
"I took the cooking class for enjoyment, but I also learned a lot."
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Class as a noun (countable):
A group of students who commenced or completed their education during a particular year. A school class.
Examples:
"The class of 1982 was particularly noteworthy."
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Class as a noun (countable):
A category of seats in an airplane, train or other means of mass transportation.
Examples:
"I used to fly business class, but now my company can only afford economy."
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Class as a noun (taxonomy, countable):
A rank in the classification of organisms, below phylum and above order; a taxon of that rank.
Examples:
"Magnolias belong to the class Magnoliopsida."
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Class as a noun:
Best of its kind.
Examples:
"It is the class of Italian bottled waters."
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Class as a noun (set theory):
A collection of sets definable by a shared property.
Examples:
"The class of all sets is not a set."
"Every set is a class, but classes are not generally sets. A class that is not a set is called a proper class."
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Class as a noun (military):
A group of people subject to be conscripted in the same military draft, or more narrowly those persons actually conscripted in a particular draft.
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Class as a noun (object-oriented, countable):
A set of objects having the same behavior (but typically differing in state), or a template defining such a set.
Examples:
"an abstract base class'"
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Class as a noun:
One of the sections into which a Methodist church or congregation is divided, supervised by a class leader.
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Class as a verb (transitive):
To assign to a class; to classify.
Examples:
"I would class this with most of the other mediocre works of the period."
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Class as a verb (intransitive):
To be grouped or classed.
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Class as a verb (transitive):
To divide into classes, as students; to form into, or place in, a class or classes.
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Class as an adjective (Irish, British, slang):
great; fabulous