No, not in the usual sense. An allergy is a reaction to a stimulus that is by itself noxious to the body in some way. A word may bring about a conditioned response, but it is the conditioning that evokes the response and not the word itself. No words, independent of any conditioned responses to them, have the ability to bring about an allergic response.
Yes
It is possible for someone allergic to horses to also be allergic to camels. The allergy is most likely to the dander, and horses and camels can have similar dander.
Yes it is possible to be allergic to algae.
Yes, only if you are actually allergic to collagen. It is possible to be allergic to collagen.
No but someone could be allergic to sand.
no no
you can be allergic to just about anything
yes my grandfather was so my family has a fear of the dragonfly because we didn't know it was possible to be allergic to them until him
No, it is not possible to be allergic to blood. Your immune system violently reacts to the allergens you are allergic to. If anyone were allergic to blood, they'd be dead by now. But it is possible to have a phobia of blood.
I think that might be possible. I mean, since some people who are allergic to peanuts, CAN get allergic reactions from the smell of the peanut. If someone is allergic to crayfish, they have a chance of getting allergic reactions from the smell of the crayfish. Although, to my knowledge, all I know is that this occurs to certain people. Not all. Depends how severe the symptoms is.
Yes! My mother is allergic to both.
Yes, if they are allergic to an ingredient inside them.