Variables or factors.
I hope that helps.
A catalyst
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In the case of a self-titled album, such as Buddy Holly's Buddy Holly, it is called eponymous.In the case of a a word that has no lexical connection to anything else, like if you discovered something brand new and you immediately though thystusamusto (I hope that's not a real word), it is called a neologism.
That would an ambigram. That is, if your question meant to say "reads as one word one way, and says something else upside-down."
if your using something like "if an," or something else.
A stimulus is an event or action that makes something else happen. Other possible answers are trigger or impetus.
A six letter word to command not to do something is to forbid.