Common words:
* LACK
* LAME
* LASH
* LAZY
* LEAD
* LEAF
* LEAP
* LEFT
* LEND
* LENT
* LESS
* LICK
* LIEU
* LIFE
* LIKE
* LIME
* LINE
* LINK
* LIST
* LIVE
* LOAD
* LOAN
* LOFT
* LONG
* LOOK
* LOOS
* LORD
* LOSS
* LOVE
* LUCK
* LURE
* LYRE
Less common words:
* LACE
* LADE
* LADS
* LAIR
* LAKE
* LAMB
* LAMP
* LAND
* LANE
* LARK
* LASS
* LAWS
* LEAD
* LEAN
* LEER
* LENS
* LESS
* LETS
* LEVY
* LIAR
* LIBS
* LIFT
* LILY
* LIMP
* LING
* LIPS
* LIRA
* LITE
* LOAD
* LOAM
* LOAN
* LOBE
* LOCK
* LODS
* LOFT
* LOGS
* LOOP
* LOPE
* LOSE
* LOTS
* LOUD
* LUG
* LUMP
* LURE
* LUSH
* LYNX
This is not an exhaustive list, but it gives you a good starting point. Let me know if you need more ideas!