Yes, trail is playable
...and is worth 6 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Trail" Definition
noun
A mark, trace, course, or path left by a moving body.
A marked or beaten path, as through woods or wilderness.
A succession of things that come afterward or are left behind: left a trail of broken promises.
Something that hangs loose and long: Trails of ticker tape floated down from office windows.
Something that is drawn along or follows behind; a train: The mayor was followed by a trail of reporters.
verb-transitive
To allow to drag or stream behind, as along the ground: The dog ran off, trailing its leash.
To drag (the body, for example) wearily or heavily.
To follow behind: several cruisers trailed by an escorting destroyer.
To follow the course taken by; pursue: trail a fugitive.
To follow the traces or scent of, as in hunting; track.
verb-intransitive
To be behind in competition; lag: trailing by two goals in the second period.
To become gradually fainter; dwindle: His voice trailed off in confusion.
To drift in a thin stream: smoke trailing from a dying fire.
To extend, grow, or droop loosely over a surface: vines trailing through the garden.
To walk or proceed with dragging steps; trudge.
verb
To hang down so as to drag along or sweep the ground.
To extend over a surface in a loose or straggling manner.
To grow to such length as to droop over toward the ground.
To walk or proceed draggingly, heavily, or wearily.
To lag behind do poorly in relation to others.
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