I want to know the answer to the following question:
What word supplement  can be put on an already existing word base?
All the background I'm provided with is that "Many times, several affixes are appended to a preexisting lexeme, and some sound alternations can occur, for example elèctric [əˈlɛktrik] ("electrical") vs. electricitat [ələktrisiˈtat].". Is that enough to answer the question?
Answer: yes