Number

If man in a compound noun in singular word does not refer to a human,only "s" should be added after the  word to make it in plural form.i.e.

singular.........................plural

German......................Germans

Norman......................Normans

Mussalman...............Mussalmans

Brahman.....................Brahmans

9)If there is full with a singular compound noun,only "s" is added to make it a plural noun.i.e.

singular.........................plural

Handfull.......................Handfulls

Spoonfull...................Spoonfulls

Mouthfull...................Mouthfulls

10)If a compound noun has many parts,the main part of it should be turned into plural word.i.e.

singular........................................plural

Brother-in-law.........................Brothers-in-law

Father-in-law..........................Fathers-in-law

Mother-in-law........................Mothers-in-law

Passer-by..............................Passers-by

Step-brother..........................Step-brothers

Maid-servant.........................Maid-servants

Commander-in-chief...........Commanders-in-chief

Book-case.............................Book-cases

Book-shelf............................Book-shelfs

Forget-me-not.......................Forget-me-nots

Poet-laurete..........................Poet-lauretes

Major-general.......................Major-generals