Word pyramid

A loop can go inside another loop. The inner one runs all the way through on every single pass of the outer one — which is how you build something two-dimensional out of two one-dimensional counts.

One more thing you will need: print() normally ends the line for you. Tell it not to, and several prints land side by side on the same line:

print("a", end="")
print("b", end="")
print()             # an empty print ends the line

That prints ab, then finishes the line.

Print the first letter of word once, the second letter twice, the third three times, and so on to the end. Each letter's run goes on its own line.

For word = "toby" that is:

t
oo
bbb
yyyy

Your code has to work for any word — the checks try another one.