Well, to put it simply, keywords are not case sensitive. ... No matter, whether you search the keyword in upper case or lower case, the search engine will give you the same results. Google Adwords is not case sensitive and therefore, it won't affect the search results.

Can keywords be capitalized?

Title case: The first letter of all keywords will be capitalized. For example, “Dark Chocolate.” Sentence case: Only the first letter of the first keyword will be capitalized. For example, “Dark chocolate.”

Does capitalization matter in keyword search?

Results: Google now considers the keyword phrase the same for all methods of capitalization. The only benefit for capitalization (camelcase) within SERPS is for ease of readability and “increased click-through rate”.