Ablaze (Burning fiercely, or something brightly colored.)
Accentor (A dull-colored Eurasian songbird)
Accipiter (A genus of medium-sized forest-dwelling hawks that have short broad wings and a long tail.)
Achondrite (A stony meteorite without rounded grains)
Acorn (Fruit of the oak tree.)
Actinolite (A fibrous mineral that can be pale green, yellow, blue and black.)
Adret (The sun-facing side of a mountain.)
Adularia (A white or colorless mineral often found in the alps)
Aegolius (A genus of small owls)
Aerial (Of, relating to, or occurring in the air or atmosphere.)
Aerie (A large nest of a bird of prey, especially eagles, typically built high in a tree or on a cliff.)
Aerosol (Small particles suspended in the atmosphere.)
Afterburn (A burning sensation.)
Agate (A variety of chalcedony that comes in many colors, often with swirl or banded patterns throughout.)
Aiguille (A sharp-pointed pinnacle of rock.)
Airstream (A current of air.)
Alabaster (A mineral often used for carving.)
Alabio (An Indonesian duck breed.)
Alate (To have wings or wing-like appendages.)
Albite (A pale-colored, usually white, mineral.)
Alder (A type of tree from the birch family with toothed leaves.)
Alev (A Turkish name meaning 'flame'.)
Alexornis (A prehistoric bird.)
Algodonite (A copper arsenide mineral.)
Alizarin (A red pigment.)
Almandine (A type of garnet with a violet tint.)
Alp (A high, rugged mountain that is often snowcapped.)
Alpaca (A domesticated mammal related to the Llama and known for its wool.)
Alpenglow (The rosy light of the setting or rising sun seen on high mountains.)
Alpine (Relating to high mountains.)
Altitude (The height of an object or point in relation to sea or ground level.)
Alto or Altocumulus (A fleecy cloud formation that occurs at a medium altitude.)
Altostratus (A fairly uniform mid-altitude layer of gray cloud.)
Alunite (A white, gray, or reddish mineral that can be found in volcanic rocks.)
Amaranth (A purple color.)
Amaterasu (The Japanese Shinto goddess personifying the sun.)
Amber (A hard and translucent fossilized resin, or a yellow/orange color.)
Amblygonite (A pale yellow gem.)
Amethyst (A violet or purple quartz gem or a violet color.)
Ammolite (An opal-like gemstone made of the fossilized shells of ammonites.)
Analcime (A white, gray or colorless mineral.)
Anapaite (A green mineral.)
Anatase (A rare gemstone that comes in many colors.)
Andalusite (A gemstone that is typically brown, red or green.)
Andes (A South American mountain range.)
Andesine (A rare gem known for it's orange-red and red colors, but also comes in yellow, green, and blue.)
Andesite (A gray lava rock with white and black speckling. The speckles are crystals such as feldspar or quartz.)
Andradite (A kind of garnet that comes in many colors.)
Angelite (A blue gemstone but can also be white, violet, colorless, or dark gray.)
