Common Words:
* Lanky
* Laugh
* Later
* Least
* Leave
* Legal
* Lemon
* Light
* Likely
* Loamy
* Loose
* Lower
* Lunch
Less Common Words:
* Lacks
* Laden
* Lambs
* Lance
* Latin
* Lauch (a type of boat)
* Leash
* Leery
* Ledge
* Lentil
* Leper
* Level
* Libra
* Libya
* Lilac
* Limbo
* Limp
* Lines
* Links
* Lippy
* Lisps
* Loath
* Lobby
* Locks
* Logic
* Looms
* Lunar
Please note: This is not an exhaustive list, and there are other 5-letter words starting with "L."