No, despair is an abstract noun; a word for an emotion.
The collective noun is a wilderness of despair. The noun despair is also a collective noun for a despair of writers, a despair of goths.
Gloom as an absence of light is a concrete noun, detectable by sight. Gloom as an emotional state, depression or despair, would be an abstract noun.
an x in concrete
The word 'despair' is both a noun (uncountable) and a verb (despair, despairs, despairing, despaired).The noun 'despair' is a word for a complete loss of hope; a person or thing that is the cause of a complete loss of hope.
"Despair" is a noun or a verb.
Concrete. (You can see it, feel it, bite it!)
The word 'despair' is an abstract noun, a word for a complete loss or absence of hope; a word for an emotion.The abstract noun forms of the verb to despair are desperation and the gerund, despairing.
The noun 'cafeteria' is a concrete noun as a word for a physical place.
It is both.
The noun 'Philadelphia' is a concrete noun, a word for a physical place.
Concrete. (But few bathtubs are made out of concrete.)
The noun 'oranges' is the plural form for the noun orange, a common, concrete noun; a word for a thing.