Autistic count

I just simply cant remember the word. Its like my brain is searching for the scientific version but I want the common conversation version. (Like Cat and Feline, Dog and Canine.)

I get that with Japanese and I've only been studying Japanese for 5 years... I could be having a conversation to one of my friends in English and all of a sudden, a Japanese word pops out of my mouth without me realizing it. They get pissed and I get confused. It's quite funny, actually.