1) a group of people with the same interests (who often discourage others from joining them) (clique)

2) (of a person) pleasant and having the same or a similar nature, interests etc (congenial)

3) (of a person) well-educated and with many cultural interests (cultured)

4) not influenced by personal feelings or interests (disinterested)

5) a group of people in a larger group (e.g. a political party) with different views, often ones that suit their own interests (faction)

6) a society of men who treat each other as equals and who have the same common interests etc (fraternity)

7) to declare that one has (beliefs, likes, ignorance, interests etc) (profess)

8) unity because of common aims, beliefs, interests or feelings (solidarity)

9) (an instance of) killing oneself; any act that harms one's interests or welfare (suicide)