Answer: tastebuds

AnswerCrossword Clue
TASTEBUDSThey're on the tip of your tongue
TASTEBUDSThey know the difference between sweet and sour
TASTEBUDSWhat caper samplers do?
TASTEBUDSSweetness sensors
TASTEBUDSThey may be at the tip of your tongue
TASTEBUDSThey may be excited by dinner
TASTEBUDSThey are on the tip of your tongue