When a noun ends with ه pronounced "a", the ه can optionally be changed into گ before the plural آن:
"writers" نویسندگان - "writer" نویسنده
Nowadays in the written form, it is becoming a rule to retain ه and add the گ:
"writers" نویسنده گان
"specialists" خبره گان
If the plural آن is added to a noun ending in vowels ا or و , then insert ی before the plural ending:
"gentlemen" آقایان - "gentleman"آقا
"truthful persons" راستگویان - "truthful person" راستگو
See Also: