Descriptive:
boring movie/loud restaurant
fast sailboat/sweet song
Item and Catergory:
mansion house/pediatrician doctor
Completion:
bite your tongue/break a leg
a drop in the bucket/a piece of cake
Sound Relationships:
kindle spindle/mountain fountain
Answer:
Contagious, sanity, try???
Explanation:
I don't know if the last one is try, or something else like go.