different between istanbul vs bosphorus

istanbul

istanbul From the web:

• what istanbul means
• what istanbul famous for
• what istanbul airport
• what's istanbul like
• istanbul what to do
• istanbul what to visit
• istanbul what to wear
• istanbul what to buy

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bosphorus

bosphorus From the web:

• bosphorus what to do
• what does bosphorus mean
• what is bosphorus in istanbul
• what is bosphorus bridge
• what is bosphorus cruise
• what is bosphorus treaty
• what does the bosphorus strait divide
• what is the bosphorus presumption