Why is "letter" not plural in "two letter words"?
124907
Two-year program or Two-years program?
53392
Should I use plural noun after ''both'' in the sentence below?
126976
E-mail from Stack Exchange with incorrect plural
29007
Multiple letters without spacing in Math
120508
Why does the introduced part-title in letter appear twice?
14397
Plurals of acronyms, letters, numbers — use an apostrophe or not?
54644
Is "each" singular or plural?
99124
Is it true that only the positions of the first and last letter in a word matter, the rest can be scrambled?
78655
Why does pluralization of compound words typically occur in the middle as opposed to the end of the word?
127936
Difficulties with deciding whether it is a plural or singular
11345
Single Markers Used For Punctuation of Plurals
826
What is the number of ways to select ten distinct letters from the alphabet $\{a, b, c, \ldots, z\}$, if no two consecutive letters can be selected?
122592
Is "a couple of something" plural or singular?
32508
how many ways can the letters in ARRANGEMENT can be arranged
31610
Plural of an initialism that ends with the letter S
119928
When uncertain if refering to multiple or single should the plural form or singular form be used?
139249
'An avalanche of mail'? - it should be 'mails', shouldn't it?