Answer: tastebuds

AnswerCrossword Clue
TASTEBUDS

They're on the tip of your tongue

TASTEBUDS

They know the difference between sweet and sour

TASTEBUDS

What caper samplers do?

TASTEBUDS
Sweetness sensors
TASTEBUDS
They may be at the tip of your tongue
TASTEBUDSThey may be excited by dinner
TASTEBUDSThey are on the tip of your tongue