Collocations for tummy - noun

empty, full
upset

rumble
ache

ache, bug, trouble, upset (all BrE)
I had a slight tummy upset.

button (BrE)

in the/your tummy
I get a fluttery feeling in my tummy before meeting new people.

bulging, fat, flat

pull in
pat, rub, tickle

muscles
tuck
cosmetic surgery like facelifts and tummy tucks

on the/your tummy