The word is step.
footstep, step latter
Ball
step ladder
foot
ladderproof
Yes, "footstool" is a compound word made up of the words "foot" and "stool" combined.
Yes, "footloose" is a compound word. It is formed by combining "foot" and "loose" to create a new word with a unique meaning.
footed
Yes football is a compound word. The words are foot and ball.
Foot print
Weird
Yes, "oppression" is a compound word formed by combining the prefix "op-" and the root word "pression."
Footwork
One compound word you can make is "raincoat."