Aromatic grape varieties or wine grapes described as aromatic should refer only to those grapes whose aromatic molecules are mostly from the terpene class (see terpenes), says Dr Ian D’Agata (Italy’s Native Wine Grape Terroirs, p19). His classification is as follows:
Not at all aromatic: Chardonnay. | Cortese. | Malvasia Bianca di Candia. | Pinot Bianco.
Other aromatic varieties: Lacrima. | Pinot Gris. | Riesling. | Sauvignon Blanc. | Viognier.
Dr Ian d’Agata, Italy’s Native Wine Grape Terroirs (University of California Press, 2019).
Oxford Companion to Wine 4th edition ed. Jancis Robinson MW and Julia Harding MW (Oxford University Press, 2015), p.39.