Jaybird 
To dream of a jaybird denotes performing work that is enjoyable but not productive. A jaybird that is dead is indicative of an argument or disagreement that you are having with a loved one.
Jet Ski
To dream of a jet ski represents a series of plights towards self-awareness and discovery. You are trying to explore your unconscious in a very purposeful manner. Additionally, the dream may imply sexual relationships or exploits.
Jumping
To dream that you are jumping signifies that you need to be more adventurous and take on more risks. You will be successful in attaining your goals.
To dream that you fail to jump means that you fear the uncertainties of life. You feel at ease in maintaining status quo.
Juniper
To dream of a juniper tree indicates that joy and prosperity will arise from disappointment, misery, and gloominess.
Jupiter
To dream of the planet Jupiter stands for victory, optimism, generosity, and lavishness.
Leather
To dream of leather indicates sturdiness and toughness. You seek refuge from the harshness of the world around you.
To dream of leather is also suggestive of the carnal nature in your waking life.
Leeward
To dream that you are sailing leeward tells of exciting travels and adventures.
Legumes
To dream of legumes denotes petty fights and minor setbacks.
Leveler
To dream of a leveler signifies unity and understanding. Every aspect of your waking life is in order. This dream suggests that you must try to look at things from every possible angle to gain better insight.
Lobster
To dream of a lobster symbolizes power and dedication. In all you do, you always come out victorious.
To dream that you are eating lobster denotes that you will get back on your feet and face the world with confidence.