kac(a)-, n. Forest. Gender: B, Stems: /tːs/ <cc> - /ts/ <c> - /s/ <s>, Ablaut: /a/ <a> - /ɒ/ <å> - /ɛ/ <e>, Nominative singular: /katːsa/ <kacca>, Accusative singular: /kɒtsi/ <kåci>, Allative singular: /kɛsaβɒ/ <kesabå>. This is commonly used in compounds to form the names of forests.