Alliaceous refers to anything derived from or resembling garlic or onion. Some common synonyms for alliaceous include garlicky, oniony, pungent, spicy, and tangy. All of these words can be used to describe foods that have a strong aroma and flavor reminiscent of garlic or onion, such as chives, scallions, and leeks. Other synonyms for alliaceous could include sharp, zesty, and bold. These words can be used to describe foods that have a powerful taste, whether it's from the use of alliaceous vegetables or other spices and seasonings. Ultimately, there are many ways to describe the unique flavor and aroma of alliaceous foods.