Laughing is an action, so 'laugh' is a verb.

 'Launder' means to wash clothes. It is an action, so it is a verb.

'To launch' is an action, so it is a verb.

'Lavatory' refers to a bathroom or a restroom. It is a noun.

 'Lava' refers to molten rock expelled by a volcano. It is a noun.

 'Laurel' is an antiquity worn on head as a symbol of victory. It is a noun.

'Leaf' is a part of plant. It is a noun.

 'Law' is the collection of rules imposed by an authority. It is a noun.

'Lavish' can be both a verb or an adjective. When it is used to mean 'to spend', it is a verb. When it is characterised by extravagence, it is an adjective.

 'Leap' means to jump. It is an action, so it is a verb.

 'Leak' is an escape through a hole or a crack. It is a noun.

 'Learn' means to gain new knowledge. It is an action, so it is a verb.

'Lead' means to go in front or to serve as a leader. It is an action, so it is a verb.

 'Legal' means something that is allowed by authorities. It is an adjective.

 'Least' is the superlative of 'little'. It is an adjective.

 'Leave' can be used as both, a verb or a noun. Leave, when used as an act of departing politely or as a period of absence from work is a noun. When leave refers to going away, it is a verb.

 'Leather' is the material made from animal skin. It is a noun.

'Legalise' means to make legal. It is an action, so it is a verb.

 'Legate' is a member of an envoy. It is a noun.

 'Legend' is a fable or story passed down the generations. It is a noun.

 'Lax' refers to lacking in rigour or strictness. It is an adjective.

 'Legible' means something that can be read. It is an adjective.

 'Lay' means to put something down horizontally. It is an action, so it is a verb.

'Lazy' means disinclined to work. It is an adjective.

 'Legislate' means to make laws. It is an action, so it is a verb.