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 contained in some way.
To support someone or something, you give your help or agreement; for example, you can support a person by giving them aid, or you can support an idea with facts to prove it.
ask humbly (for something)
the activity of supplying or providing something
express a supposition
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