No one thinks in spoken language. The construct of words is not the kernel of thought. More like the parsing of your subconscious thoughts (neurons firing) into human-readable language.

Think of raw thought as machine code and internal monologue as a high-level programming language. Binary vs JavaScript. Some people are able to interact meaningfully with their subconscious machine code while others must abstract it into spoken language. There is an infinite spectrum between the two extremes that we all constantly tread.

Infants who don't know how to talk yet and animals (as well as hominids before language) do not think in words. Brains are not constructed in such a way as to use spoken language words as the fundamental component of thought.

I, personally, almost never think or reason about things in human language unless I am talking, practicing a speech, or writing. Then I must manually construct each word. I think deeply about things quickly and make useful logical connections between disparate topics that others tend to miss, but I tend to be slow at communicating.