挨拶[aisatsu] greeting
挨拶回り[aisatsumawari] courtesy call
挨拶状[aisatsujou] greeting card
挨拶は抜きで[aisatsuhanukide] without compliments (greetings)
挨拶を交わす[aisatsuwokawasu] to exchange greetings

御挨拶[goaisatsu] greeting
一挨一拶[ichiaiissatsu] dialoging (with another Zen practitioner to ascertain their level of enlightenment)
時候の挨拶[jikounoaisatsu] season's greetings (conventional way of beginning a letter)
年頭の挨拶[nentounoaisatsu] New Year's greetings
年頭挨拶[nentouaisatsu] New Year's greetings