where could I find the affix "over"?

Question

What does -es mean?

Answer 1

overemphasize
overturn (that might be a compound word rather than an affix and root)
overcompensate

-es marks the plural of nouns ending in s, z, ch, x, o
-es marks the third person singular (he/she/it), simple present tense, of verbs ending in s, z, ch, x, o