-s

-s ¹ or -es

suff.

Used to form plural nouns: letters.

---

[Middle English -es, -s, from Old English -es, -as, nominative and accusative pl. suff.]

---

-s ² or -es

suff.

Used to form the third person singular present tense of all regular and most irregular verbs: looks; holds.

---

[Middle English -es, -s, from Old English (Northumbrian) -es, -as, alteration (perhaps influenced by Old Norse) of -eth, -ath.]

---

-s ³

suff.

Used to form adverbs: They were caught unawares. He works nights.

---

[Middle English -es, -s, genitive sing. suff., from Old English -es.]

---

-s¹, -es

suffix

forming the plural of most nouns boys boxes

[from Old English -as, plural nominative and accusative ending of some masculine nouns]

---

-s², -es

suffix

forming the third person singular present indicative tense of verbs he runs she washes

[from Old English (northern dialect) -es, -s, originally the ending of the second person singular]

---

-s³

suffix of nouns

forming nicknames and names expressing affection or familiarity Fats Fingers ducks

[special use of -s¹]