Most poetry is worded in the abstract, but an abstract of poetry is a physical thing.

Abstract Poetry is: a fish swim or die FLOAT platform 9 in stationary bicycle worth, worthless error

Gertrude Ehrlich has written:

'Fundamental concepts of abstract algebra' -- subject(s): MATHEMATICS / Algebra / Abstract, Abstract Algebra

'Fundamental concepts of abstract algebra' -- subject(s): Abstract Algebra

'Fundamental concepts of abstract algebra' -- subject(s): MATHEMATICS / Algebra / Abstract, Abstract Algebra

The noun 'poet' is a singular, common noun; an abstract noun as a word for a writer of poetry; a concrete noun as a word for a specific person who writes poetry.