Exclude, debar, blackball, eliminate, rule out, shut out, disbar, suspend are comparable when meaning to prevent someone or something from forming part of something else as a member, a constituent, or a factor.
Exclude implies a keeping out of what is already outside; it therefore suggests a prevention of entrance or admission.
Debar implies the existence of a barrier which is effectual in excluding someone or something on the outside from entering into a group, body, or system, from enjoying certain privileges, powers, or prerogatives, or from doing what those not so restrained do naturally or easily.
Blackball basically implies exclusion from a club or society by vote of its members (originally by putting a black ball into a ballot box). The term has some extended use, but it usually implies a deliberate decision or effort to exclude a person from social, professional, or economic intercourse.
Eliminate differs from the preceding words in implying a getting rid of, or a removal of what is already in, especially as a constituent element or part.
Rule out may imply either exclusion or elimination, but it usually suggests a formal or authoritative decision.
Shut out may imply exclusion of something by preventing its entrance or admission or, in sports use, to prevent from scoring.
Disbar (often confused with debar ) implies the elimination by a legal process of a lawyer from the group of those already admitted to practice, thereby depriving him for cause of his status and privileges.
Suspend implies the elimination of a person who is a member of an organization or a student at a school or college, often for a definite period of time and, usually, because of some offense or serious infraction of the rules; the term seldom if ever implies that the case is closed or that readmission is impossible.