We definitely need more information in order to be able to say anything meaningful. People often seem to think that probabilities can be worked out without knowledge of a situation, but everything depends on the details. Here, there are a lot of linguistic issues to consider, among other things.
As I read this, you appear to be asking for the probability that two different words would exist in a given language, both of which happen to be composed of three roots, all six of which are somewhat synonymous. Or something like that. It is not at all clear what probability you mean, because you have not asked the question very well.
But words don't assemble themselves randomly! I can't imagine a compound word whose three parts all mean the same thing, or even are in the same general category. So I would expect the probability of this happening at all to be zero.
The idea of two languages being involved (apparently the compound words are in, say, English, while all six parts are in, say, Chinese), and that you say the parts only "seem to be" words in another language, suggests that you may not even really be talking about
genuine compound words, which are usually compounded of words in their own language, like "haircut" or "snowball", but perhaps about accidental alignments, like if it happened that "hair" and "cut" both sounded like different words for small mammals in Chinese. (Or that "ha", "irc", and "ut" were three kinds of tree.) That might indeed be random; but you'd have to know how many syllables in English even sound like anything in Chinese.
In any case, the ultimate question will be, does whatever probability you can come up with actually mean anything. If your goal is, say, to show that these languages are related, or that the words were intentionally made to encode some secret knowledge, or whatever, then you would need to state your hypothesis, and work out probabilities relative to some null hypothesis. The world is full of claims that some probability is so low that ... whatever. But with no context, such claims are meaningless. (And historians should know this, but probably don't.)
You may benefit from reading an article I've recommended several times here:
Should Rare Events Surprise Us?