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Someone who specializes in the study of ores would be a mineralogist.
You could call someone who speaks two languages but not well a "basic or intermediate speaker" in both languages.
A person who can speak different languages is called a polyglot.
The common term for someone who speaks several languages is "multilingual."
space is a bit of a broad speciality... Astronomer is the most broad I can think of, recommend me if that is right.
a diamondologist which is a subset of gemologists (study all precious and semi-precious stones)
A physician who specializes in operating on people is a surgeon.
The word to describe someone who can speak more that one language fluently is Bilingual.That isn't correct, Bilingual means that you speak TWO languages fluently. If you speak five you are PENTAlingual
A counter.
Ophthalmologist.
No, randomly calling numbers is an unlikely way of finding someone who specializes in trailer mounted boiler rentals. It is best to look up such a business under the correct listing.
Someone who specializes in firearms