opener (suomeksi)

avain (s)
aukaisin (s)
avaaja (s: device that opens something)
pelinavaaja (s: player who starts the betting / batsman who normally plays in the first two positions of an innings)
avauskortti (s: openers: cards of sufficient value to enable a player to open the betting)
avausnumero (s: first act in a variety show)
avaus (s: first in a series of events)