The answers to the clues below will have something in common:

1. Speech using inappropriate words
2. Arch foe
3. Fondness for candy
4. Staple food associated with San Francisco and Alaska

Answers:

1. Salty language
2. Bitter enemy
3. Sweet tooth
4. Sourdough bread - four main tastes

Credit:
NY Times Crossword
Emily Carroll
TASTEMAKERS