aroma, scent and smell

This helped me:
http://butikiteas.blogspot.com/2014/04/a-beginners-guide-to-tasting-teas.html

Smell-(through the nose) When molecules pass through the nasal cavities and travel to the receptors of the olfactory gland.

Aroma-(when tea is in the mouth, it goes the back way) aroma rises through the pharynx toward the nasal cavities and reaches the olfactory gland.