Native words are further subdivided into the words of the Indo-European stock and those of the Common Germanic origin. The words having cognates in the vocabularies of different Indo-European languages form the oldest layer. It has been noticed that they readily fall into definite semantic groups. Among them we find terms of kinship (mother, father, son, daughter), names of animals and birds (cat, wolf, goose), parts of human body (arm, eye). Some of the most frequent verbs belong to this word stock: come, sit, stand. Most numerals are also of the Indo-European origin.