As for the word bases - there are many, many Turkish loanwords in Serbo-Croatian language. According to some Yugoslav linguists there are over 8000 of them. I actually happen to have the book with all of them listed but from what I've noticed 90% of those are never used and there are some really obscure words that no one probably didn't hear about since early 1800s. But there is still a noticeable number of Turkish loanwords that are part of our everyday vocabulary and they are practically irreplaceable: ?eki? (hammer), boja (colour), jastuk (pillow), kutija (box), sat (hand watch), torba (bag), pamuk (cotton), budala (fool) and many others.
As Sen has said, the loaned words that exist in the languages of the people that were once under Ottoman occupation is enormous and although some of them have been totally assimilated in those languages that does not mean their respective languages are Turkish related.
Completely different language families unrelated to each other. Besides, Turkish is considered one language that is not related to any of the European ones.
No, completely different families of languages. Serbian is Slavonic, Turkish Altaic.
NO. SERBIANS ARE EUROPEANS, TURKISH PEOPLE ARE NOT.
