Any of the big compound medical words are fun to say and construct IMO. Adrenocorticotropic, deoxyribonucleic, those kinda words. They seem big and scary but they’re quite descriptive and once you know the “formula” behind them it’s not too bad. Maybe not the most fun words but I feel good every time I can use one and deploy it like it’s no big deal (ie my mouth doesn’t fuck it up). It’s like executing a big combo with your mouth.