Let's just say that alibi is a form of defense against an accusation or an explanation to justify something. 

Authentic is the real thing/not copied (can't explain it well). Synonym: genuine, realistic, true, etc.

Campaign is a vote-seeking activity or take part to a political campaign.

For tournament, let's just say that it's a series of matches, etc. 

And for genre (which you may not mean jenre), is a category of something (e.g. style, form, subject, etc.). Synonym: sort, type, kind, etc.
I hope it helps. ☺
taking* not take part. ._.

ALIBI ---> means an excuse or defense for someone, especially by providing an account of their whereabouts at the time of an alleged act.

AUTHENTIC ---> means genuine

It's not JENRE, but GENRE ---> means any kind or sort or any category of literature, music or other forms of art or entertainment, whether written or spoken, audio or visual, based on some set of stylistic criteria.

CAMPAIGN ----> means a work in an organized and active way toward a particular goal, typically a political or social one.

TOURNAMENT ---> means a series of contests between a number of competitors, who compete for an overall prize, like as in a sport or game.