firm, heavy
I heard his heavy tread moving about upstairs.

light, soft | measured, slow, steady

hear

move

with a … ~
A policeman walked by with a slow, measured tread.

the tread of feet
The streets have echoed to the tread of feet for more than ten centuries.

tyre, wheel | deep, shallow | worn

be worn
The tyre tread has been worn below the legal limit.

depth, pattern, width

a breadth/depth/width of tread

heavily
He came down the stairs, treading as heavily as he could.

gently, lightly, softly | carefully, gingerly, warily
She trod gingerly. It would be risky to hurry. | (figurative) The government will have to tread carefully in handling this issue.

down
She planted the seeds and trod the earth down.

in
Billy trod in a big puddle.

into
Some cake crumbs had been trodden into the carpet.

on
Be careful not to tread on the flowers.