[1] : WordNet (r) 2.0

substitution class
     n : the class of all items that can be substituted into the same
         position or slot in a grammatical sentence are in
         paradigmatic relation with one another syn: paradigm
see also:
paradigm 

Class >> C Words
Class, definition of term: Class
class_pag1.html

Class Struggle >> C Words
Class Struggle, definition of term: Class Struggle
class+struggle_pag1.html

Class Library >> C Words
Class Library, definition of term: Class Library
class+library_pag1.html

Class Structure >> C Words
Class Structure, definition of term: Class Structure
class+structure_pag1.html