What word can be attached at the beginning or end of these words to make different words?

• Form
• Line
• Mark
• Wet
• Main
• Grass

Hint:

The word is 4 letters long.

• This same type of puzzle is in the brain games book – Duck Aug 16 '18 at 1:50

The word is:

LAND

We can make the words:

landform, landline, landmark, wetland, mainland, grassland

• The number of the beast as your rep number needs to be terminated for good. $(+1)$ – Mr Pie Aug 16 '18 at 0:48