Rasa is essence, flavor, or sentiment, in
particular the characteristic quality of music, literature, and drama.
In Ayurveda it has many meanings; juice, potency, soup, blood, plasma,
etc. 

Veda is knowledge. It is the most ancient
Hindu scriptures, written in early Sanskrit and containing hymns,
philosophy, and guidance on ritual for the priests of Vedic religion.
Believed to have been directly revealed to seers among the early Aryans in India, and preserved by oral tradition, the four chief collections are the Rig Veda, Sama Veda, Yajur Veda, and Atharva Veda. Out of Vedas
came Ayurveda.