Ask a human.

“What’s the scientific term for when a word is on the tip of your tongue?”

“It’s literally just TOT (tip of the tongue)”

I initially thought your question would be about translating technical terms between languages. If it’s an extremely technical term that’s unlikely to be in a dictionary I look up the Wikipedia article in English and then see if there’s a corresponding article in the target language (usually Spanish in my case). The above phenomenon is PDL (punto de la lengua) in Spanish.