Word Groups 4

The following list of words can be arranged into four groups, with three words per group. Part of the teaser is to figure out why they can be grouped like this, but check the hint if you need help.

ABLE, ABLE, DRAW, LING, MAIN, OUTS, PARK, SHOO, TAIN, TING, TRAP, WITH

hint?

ETA: i get it!

Main tain able -- makes a word.. maintainable

Trap shoo ting -- trapshooting

and now i'm lost again!

Hint

The three words in each group can be combined into one 12-letter word.

Answer
MAIN TAIN ABLE (maintainable)
OUTS PARK LING (outsparkling)
TRAP SHOO TING (trapshooting)
WITH DRAW ABLE (withdrawable)