There does not appear to be a phobia named specifically for the fear of mayonnaise. See Related links
mayoitis
No, mayonnaise is a condiment.
No, mayonnaise is not a gas. Mayonnaise is a semi-solid or thick liquid.
It depends on the mayonnaise. You can even get egg-free mayonnaise which is equivalent to an infinite amount of mayonnaise for each egg.
Mayonnaise is a noun.
Possibly...
mayonnaise
Usually they are about the same.
No. There are hair products that that use the word "mayonnaise" in them but it is not the mayonnaise you eat.
Mayonnaise and mayo are the same thing. "Mayo" is just a shortened version of "mayonnaise."
What is Aioli mayonnaise flavored with?Garlic!
None. There is no seafood in real mayonnaise.