Aquavit, bitter, calvados, cognac, armagnac, brandy, gin, and tequila—share the commonality of being distilled alcoholic beverages. Here’s a more comprehensive breakdown of their shared attributes:

1. Distillation: All of these spirits are created through a process of fermentation followed by distillation. This distillation process involves heating the fermented liquid to separate alcohol from the other components.
2. Alcohol Base: Most of these spirits are made from a fermented base, which can include various ingredients such as grains, fruit juices, or agave nectar, depending on the type of spirit.
3. Flavoring: Many of these spirits are flavored or influenced by additional ingredients. For example, aquavit is flavored with herbs and spices, gin is flavored with juniper and other botanicals, and calvados is apple-flavored due to its production from apple cider.
4. Aging: Several of these spirits, including cognac, armagnac, brandy, and some types of tequila, are aged in oak barrels to develop their flavors and characteristics over time.
5. Geographical Indications: Some of these spirits, like cognac and armagnac, have specific geographical indications that dictate where they can be produced. For instance, cognac comes exclusively from the Cognac region in France, and armagnac originates from the Gascony region in France.
6. Cultural Significance: Many of these spirits have cultural significance in their countries of origin. For instance, tequila is closely tied to Mexican culture, while cognac and armagnac have deep roots in French traditions.
7. Variety of Styles: Each of these spirits has various styles and types that can range in terms of aging, flavor profiles, and production methods. For example, cognac has designations like VS, VSOP, and XO indicating different levels of aging.

While these spirits have common elements, they each have their unique characteristics that make them distinct and cherished within the world of alcoholic beverages.