The noun 'kind' is an abstract noun. There is no form for kind that is a concrete noun.
eyes = a plural, common, concrete noun. eye = singular, common, concrete noun.
The word tomato is a singular, common, concrete noun; a word for a thing.
common noun
Air is a common, concrete noun.
Air is a common, concrete noun.
Meteorite is a common concrete noun
The noun children is a plural, common noun, concrete noun.
The noun 'paper' is a singular, common, concrete noun.
The noun fiber is a singular, common, concrete noun.
The noun scientist is a singular, concrete, common noun.
"Document" is a singular, common, concrete noun.
bank account is a concrete noun.