Compounds of 歓

• 温かい歓迎
  (n) warm reception
• 歓を尽くす
  (exp) to enjoy oneself to one's hearts content
  to enjoy oneself to the full
• 歓心を買う
  (exp,v5u) to win favour
  to win favor
• 新歓コンパ
  (n) welcome party for new students, club members, etc.
• 盛んな歓迎
  (n) cordial reception