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Only nine words put M first and P third, and seven of them open with MO. There is very little here to work with.
O takes the second box in seven of the nine, seventy eight percent, and A takes the other two. No other letter appears there, which makes the second box a near certainty rather than a question.
MAPLE and MOPED are the two words here in ordinary use. They differ in the second box and again at the end, so as a pair they split the page about as well as anything could.
MOPES, MOPER and MOPEY come off the same stem as MOPED and differ only in the last box. Landing on that stem tells you four letters and leaves the fifth entirely open.
MOPPY, MOPSY and MOPUS are the remaining O branch entries and none is a word you would produce. MAPAU, a tree, is the second A entry alongside MAPLE.
E fills the fourth box in four of the nine, forty four percent, which is the one reliable signal on the page.
Play MAPLE first. It is common, it tests the smaller branch, and a miss tells you the answer is almost certainly in the MOP stem where the last box decides everything.
Both spellings are identical and the list carries the one form. It runs M, O, P, E, D either way, so the pattern does not distinguish them.
A tree. It is one of only two words here with A in the second box, the other being MAPLE.
MOPE is a short common verb and English attaches several endings to it. Those forms make up most of the O branch without adding any variety.