lifelessness
listlessness
longitudinal
loquaciously
lusciousness
Lighthearted is a 12 letter word. Lithographed is another 12 letter word that starts with L and ends with D.
A 5 letter word that starts with an L is Lipid
Lungs.
letter
yes.
literal
Large
Lethargic
Lent
laugh
lice
Hey