To supplant someone is to replace them with someone else, usually because the latter is more powerful or better in some way.
A supplicant is someone who humbly and respectfully asks for something from another who is powerful enough to grant the request.
When you supplement, you add on some extra to something to make up for a lack in it.
When something is suppressed, it is blocked from occurring or kept in check in some way.
When you support someone in doing something, you help or aid them in doing it or agree with what they are doing.
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