Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
substitute [ˈsʌbstɪtjuːt] n (person) заме́на; (:FOOTBALL etc) запасно́й m adj (игро́к#) (thing) замени́тель m
vt
to substitute A for Bзаменя́ть (замени́ть*perf) А на Б
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.