This list of nuts and seeds can give you ideas for healthy snacks and healthy packed lunches.
These are culinary nuts--food items regarded as nuts. That's somewhat different than botanical nuts.
In botany, a "nut" is a kind of fruit with a precise definition:
A fruit with a hard shell; a seed within that is unattached to the shell; and the shell never spontaneously opens to release the seed.
The definition is not very relevant to culinary nuts.
A culinary nut is just whatever is thought of as an edible nut. It's generally a kind of edible fruit with a hard shell, or it may be the edible seed of a fruit.
Other family members: mango, poison ivy, poison oak, poison sumac.
See Types of Vegetables for other legumes.
See List of Fruits for more palm family fruits.
See List of Fruits for more Rose family fruits.
Butternut / White walnut
English walnut / Persian walnut
Heartnut / Japanese walnut
See Types of Vegetables for other members of the Composite family.
See Types of Vegetables for other members of the Gourd family.
The Food and Drug Administration has created a list of tree nuts for the purpose of labeling allergic ingredients.
In 2004, the Food Allergen Labeling and Consumer Protection Act (FALCPA) identified "major allergens," believed to be responsible for 90% of true food allergies. It directed that these allergens should be labeled when they are ingredients in food.
The major allergens are: milk, egg, fish, Crustacean shellfish, tree nuts, wheat, peanuts, and soybeans.
Tree nuts are major allergens, and so are two legumes: peanuts (a culinary nut) and soybeans.
Chestnut (Chinese, American, European, Seguin)
Filbert / Hazelnut
Macadadmia nut / Bush nut
Pine nut / Pinon nut
Walnut (English, Persian, Black, Japanese, California), Heartnut, Butternut
The FDA's Guidance notes that this list "may include a species that has no food use"!
Source: Food and Drug Administration, Guidance for Industry: Questions and Answers Regarding Food Allergens
Even though most nuts are not closely related, it's not uncommon to be allergic to all nuts.
Few people, however, are allergic to coconut.
I'm going to refer you to the excellent site Food's Healing Power for fascinating, user-friendly information about the health benefits of nuts!