• baja nigricollis,
• maja nigricollis,
• jaja nigricollis,
• haja nigricollis,
• nzja nigricollis,
• nsja nigricollis,
• nwja nigricollis,
• nqja nigricollis,
• naha nigricollis,
• nana nigricollis,
• nama nigricollis,
• naka nigricollis,
• naia nigricollis,
• naua nigricollis,
• najz nigricollis,
• najs nigricollis,
• najw nigricollis,
• najq nigricollis,
• naja bigricollis,
• naja migricollis

The adjective form of the word "Naja Nigricollis" is "nigricollis". It describes something that is related to or characteristic of the Naja Nigricollis, which is a species of snake commonly known as the black-necked spitting cobra.

The plural form of "Naja Nigricollis" is "Naja Nigricollis" as it is a scientific name and does not typically change in its plural form.

The singular form of the word "Naja Nigricollis" is "Naja Nigricollis". It is the scientific name for a species of snake commonly known as the black-necked spitting cobra. It does not have a different singular form.