Definitions

aro·ma·ther·a·py
a preparation of fragrant essential oils extracted from herbs, flowers, and fruits ; broadly : the use of aroma to enhance a feeling of well-being

per·fume
Pronunciation: 'p&r-"fyüm, (")p&r-'
Etymology: Middle French perfum, probably from Old Provençal, from perfumar to perfume, from per- thoroughly (from Latin) + fumar to smoke, from Latin fumare, from fumus smoke -- more at FUME
1 : the scent of something sweet-smelling
2 : a substance that emits a pleasant odor ; especially : a fluid preparation of natural essences (as from plants or animals) or synthetics and a fixative used for scenting

fra·grance
Pronunciation: 'frA-gr&n(t)s
1 a : a sweet or delicate odor (as of fresh flowers, pine trees, or perfume) b : something (as a perfume) compounded to give off a sweet or pleasant odor
2 : the quality or state of having a sweet odor

en·fleu·rage"ä n-"fl&r-'äzh
French, from enfleurer to saturate with the perfume of flowers, from en- 1en- + fleur flower, from Old French flor -- more at FLOWER

essential oil:
any of a class of volatile oils that give plants their characteristic odors and are used especially in perfumes and flavorings --