-es1
/ɪz/ /z/suffix
1Forming plurals of nouns ending in sibilant sounds: boxes kisses
2Forming plurals of certain nouns ending in -o: potatoes heroes
Origin
Variant of -s1.
-es2
/ɪz/ /z/suffix
Forming the third person singular of the present tense:
1In verbs ending in sibilant sounds: pushes
2In verbs ending in -o (but not -oo): goes
Origin
Variant of -s2.