substitute a person or thing that can take the place of another
substantive having a firm basis in reality and therefore important
substitutable capable of being exchanged for another or for something else that is equivalent
substitutability exchangeability by virtue of being replaceable
substituting working as a substitute for someone who is ill or on leave of absence
subsequent following in time or order
obstinate marked by tenacious unwillingness to yield
substitution putting one thing or person in the place of another
substantive dye dye with a high affinity for cellulose fibers
substandard falling short of some prescribed norm
substantival of or relating to or having the nature or function of a substantive (i.e. a noun or noun equivalent)
substructure the basic structure or features of a system or organization
substrate the material that is acted upon by an enzyme
subsidiary functioning in a supporting capacity
substitution class 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)
constitutive essential in the structure of something
destitute poor enough to need help from others
subsistence a means of surviving
statutory relating to or created by regulations
subsister one who lives through affliction