選手【せんしゅ】
player (of a sport), athlete, team member
選挙【せんきょ】
election
当選【とうせん】
being elected, being selected (for a prize, etc.), winning
予選【よせん】
preliminary contest, qualifying round, trial, heat, primary
選ぶ【えらぶ】
to choose, to select
選択【せんたく】
choice, selection, option
選出【せんしゅつ】
election, selection, choice
抽選【ちゅうせん】
lottery, raffle, drawing (of lots)
選定【せんてい】
selection
入選【にゅうせん】
being selected (for a prize, exhibition, etc.), being accepted, winning
改選【かいせん】
re-election
選択科目【せんたくかもく】
elective subject or course
互選【ごせん】
election by mutual vote, election from within a committee (party, etc.), internal vote
普通選挙【ふつうせんきょ】
universal suffrage
精選【せいせん】
careful selection