The comments contain the solution. A map and a list of Capitals and States may be useful. 1) No guessing is required and Capitals do not repeat as answers. 2) Alphabetically means in alphabetical order top to bottom. 3) Adjacent includes diagonal and Y is not a vowel. 4) Border means the physical border of the actual state. 5) Combined means the capital and its state together.
6) Vowel and consonant % means the percentage of total vowels and/or total consonants to the total letters in the word. For example Sporcle has 5 consonants and 2 vowels so it's consonant % is 71% (5/7) and it's vowel % is 29% (2/7). 7) Syllable to letter ratio means the number of syllables divided by total letters in the word(s). For example Sporcle has 2 syllables and 7 letters so it's ratio is 29% (2/7).
8) Unique means this is the only letter that has that particular characteristic. For example of the words lion, tiger and bear, lion ends with a unique letter since tiger and bear both end with the same letter R while lion is the only word in the group that ends with letter N. 9) Note for purposes of this quiz Pierre, SD has 2 syllables. I apologize to the residents.